Artiodactyla is an order of placental mammals composed of even-toed ungulates – hooved animals which bear weight equally on two of their five toes with the other toes either present, absent, vestigial, or pointing posteriorly – as well as their descendants, the aquatic cetaceans. Members of this order are called artiodactyls. The order is sometimes named Cetartiodactyla, in reference to the inclusion of cetaceans in the order beginning in the 1990s.^[1] Artiodactyla currently comprises 349 extant species, which are grouped into 132 genera. Artiodactyls live on every major landmass and throughout the oceans and in a variety of habitats, including forests, grasslands, and deserts. They come in a wide array of body plans in contrasting shapes and sizes, ranging from the 38 cm (15 in) long and 2.5 kg (5.5 lb) royal antelope to the 27 m (89 ft) long and 120 ton blue whale. Some artiodactyls, such as cattle, goats, sheep, pigs, water buffalo, camels, llamas, yaks, and gayals, have been domesticated, resulting in a worldwide distribution and population sizes for some animals of over one billion.

Artiodactyla is divided into four suborders: Ruminantia, Suina, Tylopoda, and Whippomorpha. The suborders are further subdivided into clades and families. Ruminantia contains six families, Antilocapridae, Bovidae, Cervidae, Giraffidae, Moschidae, and Tragulidae, and includes ruminant animals such as cattle, antelope, deer, and sheep. Suina contains two, Suidae and Tayassuidae, and includes pigs and peccaries; Tylopoda comprises only Camelidae, the camels and llamas; and Whippomorpha contains fourteen, Balaenidae, Balaenopteridae, Cetotheriidae, Delphinidae, Iniidae, Kogiidae, Lipotidae, Monodontidae, Phocoenidae, Physeteridae, Platanistidae, Pontoporiidae, Ziphiidae, and Hippopotamidae, and includes the aquatic whales and dolphins as well as hippopotamuses. The exact organization of the species is not fixed, with many recent proposals made based on molecular phylogenetic analysis. Three species have gone extinct since 1500 CE: the aurochs and the bluebuck in Bovidae and Schomburgk's deer in Cervidae. Additionally, the red gazelle in Bovidae is considered either extinct or to have never existed; the kouprey in Bovidae is potentially extinct, with no sightings since 1969; and so is the baiji in Lipotidae, last seen in 2002. Several other species are extinct in the wild or critically endangered.

Conventions

Range maps are provided wherever possible; if a range map is not available, a description of the collective range of species in that genera is provided. Ranges are based on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species unless otherwise noted. All extinct genera or species listed alongside extant species went extinct after 1500 CE, and are indicated by a dagger symbol "†".

Classification

The order Artiodactyla consists of 349 extant species belonging to 132 genera. This does not include hybrid species or extinct prehistoric species. Modern molecular studies indicate that the 132 genera can be grouped into 23 families; these families are grouped into named suborders and many are further grouped into named clades, and some of these families are subdivided into named subfamilies.

Artiodactyls

The following classification is based on the taxonomy described by Mammal Species of the World (2005), with augmentation by generally accepted proposals made since using molecular phylogenetic analysis.^[2]

Suborder Ruminantia

Infraorder Pecora

Family Antilocapridae

Members of the Antilocapridae family are called antilocaprids; the family is composed of a single extant species, the pronghorn.

Not assigned to a named subfamily – one genus

Name	Authority and species	Range	Size and ecology
Antilocapra	Ord, 1818 One species A. americana (Pronghorn)	Western North America (former range in yellow)	Size: 130–140 cm (51–55 in) long, plus 9–11 cm (4–4 in) tail[3] Habitats: Shrubland, grassland, and desert[4] Diet: Shrubs and forbs, as well as grass[4]

Family Bovidae

Members of the Bovidae family are bovids and include sheep, cattle, goats, antelope, gazelles, and others. Bovidae comprises 144 extant species, divided into 52 genera. These genera are grouped into eight subfamilies: Aepycerotinae, or the impala; Alcelaphinae, containing the bontebok, hartebeest, wildebeest, and relatives; Antilopinae, containing several antelope, gazelles, and relatives; Bovinae, containing cattle, buffalos, bison, and other antelopes; Caprinae, containing goats, sheep, ibex, serows and relatives; Cephalophinae, or duikers; Hippotraginae, containing the addax, oryx, and relatives; and Reduncinae, or reedbuck and kob antelopes.

Subfamily Aepycerotinae – J. E. Gray, 1872 – one genus

Name	Authority and species	Range	Size and ecology
Aepyceros	Sundevall, 1847 One species A. melampus (Impala)	Southern Africa (Common impala in green)	Size: 120–160 cm (47–63 in) long, plus 30–45 cm (12–18 in) tail[5] Habitats: Savanna, shrubland, and grassland[6] Diet: Grass and shrubs[6][7]

Subfamily Alcelaphinae – Brooke, 1876 – four genera

Name	Authority and species	Range	Size and ecology
Alcelaphus	Blainville, 1816 One species A. buselaphus (Hartebeest)	Scattered sub-Saharan Africa	Size: 150–245 cm (59–96 in) long, plus 30–70 cm (12–28 in) tail[8] Habitats: Forest, savanna, shrubland, and grassland[9] Diet: Grass[9]
Beatragus	Heller, 1912 One species B. hunteri (Hirola)	Border between Kenya and Somalia	Size: 120–205 cm (47–81 in) long, plus 30–45 cm (12–18 in) tail[10] Habitats: Savanna, shrubland, and grassland[11] Diet: Grass, as well as forbs[10][11]
Connochaetes (wildebeest)	Lichtenstein, 1812 Two species C. gnou (Black wildebeest) C. taurinus (Blue wildebeest, pictured)	Southern Africa	Size range: 170 cm (67 in) long, plus 60 cm (24 in) tail (blue wildebeast) to 242 cm (95 in) long, plus 45 cm (18 in) tail (black wildebeast)[12] Habitats: Savanna, shrubland, and grassland[13] Diets: Grass[13]
Damaliscus (tsessebe)	P. L. Sclater, Thomas, 1894 Two species D. lunatus (Topi) D. pygargus (Bontebok, pictured)	Southern Africa	Size range: 140 cm (55 in) long, plus 30 cm (12 in) tail (bontebok) to 230 cm (91 in) long, plus 42 cm (17 in) tail (common tsessebe)[14] Habitats: Savanna, shrubland, and grassland[15] Diets: Grass and burnt veldt shrubs[15]

Subfamily Antilopinae – J. E. Gray, 1821 – fifteen genera

Name	Authority and species	Range	Size and ecology
Ammodorcas	Thomas, 1891 One species A. clarkei (Dibatag)	Horn of Africa	Size: 152–168 cm (60–66 in) long, plus 25–35 cm (10–14 in) tail[16] Habitats: Shrubland and grassland[17] Diet: Leaves and shoots[16][17]
Antidorcas	Sundevall, 1847 One species A. marsupialis (Springbok)	Southwestern Africa	Size: 120–150 cm (47–59 in) long, plus 14–28 cm (6–11 in) tail[18] Habitats: Savanna, shrubland, grassland, and desert[19] Diet: Shrubs and grass[19]
Antilope	Pallas, 1766 One species A. cervicapra (Blackbuck)	India (former range in light green)	Size: Up to 120 cm (47 in) long[20] Habitats: Forest, grassland, and desert[21] Diet: Grass, as well as leaf litter, flowers, and fruit[21]
Dorcatragus	Noack, 1894 One species D. megalotis (Beira)	Horn of Africa	Size: 76–87 cm (30–34 in) long, plus 5–8 cm (2–3 in) tail[22] Habitats: Shrubland, and rocky areas[23] Diet: Shrubs[23]
Eudorcas	Fitzinger, 1869 Five species E. albonotata (Mongalla gazelle) E. rufifrons (Red-fronted gazelle) E. rufina (Red gazelle†) E. thomsonii (Thomson's gazelle, pictured) E. tilonura (Heuglin's gazelle)	Sub-Saharan Africa	Size range: 55 cm (22 in) long, plus 15 cm (6 in) tail (Heuglin's gazelle) to 120 cm (47 in) long, plus 27 cm (11 in) tail (Mongalla gazelle, Red-fronted gazelle, Thomson's gazelle)[24] Habitats: Forest, savanna, shrubland, and grassland[25] Diets: Grass and shrubs, as well as forbs and fruit[25]
Gazella (gazelle)	Blainville, 1816 Ten species G. arabica (Arabian gazelle) G. bennettii (Chinkara) G. cuvieri (Cuvier's gazelle) G. dorcas (Dorcas gazelle) G. erlangeri (Erlanger's gazelle) G. gazella (Mountain gazelle) G. leptoceros (Rhim gazelle) G. marica (Arabian sand gazelle) G. spekei (Speke's gazelle) G. subgutturosa (Goitered gazelle)	North Africa, Arabian Peninsula, Asia	Size range: 90 cm (35 in) long, plus 15 cm (6 in) tail (Dorcas gazelle) to 125 cm (49 in) long, plus 20 cm (8 in) tail (Erlanger's gazelle)[26] Habitats: Forest, shrubland, grassland, rocky areas, desert, and coastal marine[27] Diets: Grass, forbs, leaves, crops, fruit, and low plants[27]
Litocranius	Kohl, 1886 One species L. walleri (Gerenuk)	Horn of Africa	Size: 140–160 cm (55–63 in) long, plus 2–4 cm (1–2 in) tail[28] Habitats: Savanna and shrubland[29] Diet: Shrubs[29]
Madoqua (dik-dik)	(Ogilby, 1837) Four species M. guentheri (Günther's dik-dik) M. kirkii (Kirk's dik-dik, pictured) M. piacentinii (Silver dik-dik) M. saltiana (Salt's dik-dik)	Eastern and southwestern Africa	Size range: 45 cm (18 in) long, plus 3 cm (1 in) tail (silver dik-dik) to 67 cm (26 in) long, plus 6 cm (2 in) tail (Kirk's dik-dik, Salt's dik-dik)[30] Habitats: Forest and shrubland[31] Diets: Shrubs, leaves, and grass, as well as flowers, herbs, and sedges[31]
Nanger	Lataste, 1885 Three species N. dama (Dama gazelle) N. granti (Grant's gazelle, pictured) N. soemmerringii (Soemmerring's gazelle)	Eastern Africa and scattered Saharan Desert	Size range: 125 cm (49 in) long, plus 18 cm (7 in) tail (Soemmerring's gazelle) to 168 cm (66 in) long (Dama gazelle)[32] Habitats: Savanna, shrubland, grassland, and desert[33] Diets: Leaves, grass, stems, shrubs, and herbs[33]
Neotragus	H. Smith, 1827 One species N. pygmaeus (Royal antelope)	Sub-Saharan Africa	Size: 38 cm (15 in) long, plus 5 cm (2 in) tail[34] Habitats: Forest and shrubland[35] Diet: Leaves and shoots, as well as fruit and fungi[35]
Oreotragus	A. Smith, 1834 One species O. oreotragus (Klipspringer)	Southern and Eastern Africa	Size: 75–115 cm (30–45 in) long[36] Habitats: Savanna, shrubland, rocky areas, and desert[37] Diet: Shrubs[37]
Ourebia	Laurillard, 1842 One species O. ourebia (Oribi)	Sub-Saharan Africa	Size: 92–110 cm (36–43 in) long[38] Habitats: Savanna and grassland[39] Diet: Grass and shrubs[38]
Procapra	Hodgson, 1846 Three species P. gutturosa (Mongolian gazelle) P. picticaudata (Goa, pictured) P. przewalskii (Przewalski's gazelle)	Central Asia	Size range: 91 cm (36 in) long, plus 8 cm (3 in) tail (goa) to 130 cm (51 in) long (Mongolian gazelle)[40] Habitats: Grassland, inland wetlands, and desert[41] Diets: Grass, onions, forbs, legumes, sedges, and shrubs[41]
Raphicerus	H. Smith, 1827 Three species R. campestris (Steenbok, pictured) R. melanotis (Cape grysbok) R. sharpei (Sharpe's grysbok)	Southern Africa	Size range: 65 cm (26 in) long, plus 4 cm (2 in) tail (Sharpe's grysbok) to 95 cm (37 in) long, plus 6 cm (2 in) tail (steenbok)[42] Habitats: Savanna, shrubland, and grassland[43] Diets: Shrubs, grass, geophytes, berries, flowers, and fruit[43]
Saiga	J. E. Gray, 1843 One species S. tatarica (Saiga antelope)	Central Asia (historical range in white)	Size: 108–146 cm (43–57 in) long, plus 6–13 cm (2–5 in) tail[44] Habitats: Grassland and desert[45] Diet: Grass[45]

Subfamily Bovinae – J. E. Gray, 1821 – nine genera

Name	Authority and species	Range	Size and ecology
Bison (bison)	H. Smith, 1827 Two species B. bison (American bison, pictured) B. bonasus (European bison)	Scattered North America and Europe	Size range: 210–380 cm (83–150 in) long, plus 43–90 cm (17–35 in) tail (American bison)[46] Habitats: Forest, savanna, shrubland, grassland, inland wetlands, and desert[47] Diets: Grass, leaves, sedges, herbs, and roots, as well as trees, shrubs, and sagebrush[47]
Bos	Linnaeus, 1758 Ten species B. domesticus (Bali cattle) B. frontalis (Gayal) B. gaurus (Gaur) B. grunniens (Domestic yak) B. indicus (Zebu) B. javanicus (Banteng) B. mutus (Wild yak) B. primigenius (Aurochs)† B. sauveli (Kouprey) B. taurus (Cattle, pictured)	Central, southern, and southeastern Asia, plus worldwide distribution of cattle	Size range: 145 cm (57 in) long, plus 60 cm (24 in) tail (yak), to 385 cm (152 in) long, plus 60 cm (24 in) tail (wild yak)[48] Habitats: Forest, savanna, grassland, shrubland, rocky areas, and desert[49] Diets: Grass, sedges, shrubs, forbs, herbs, and bamboo, as well as leaves, fruit, flowers, lichen, moss, bark, and young branches of shrubs and trees[49]
Boselaphus	Blainville, 1816 One species B. tragocamelus (Nilgai)	Indian subcontinent	Size: 180–200 cm (71–79 in) long[50] Habitats: Forest, shrubland, and grassland[51] Diet: Grass and shrubs[51]
Bubalus	H. Smith, 1827 Five species B. arnee (Wild water buffalo) B. bubalis (Water buffalo pictured) B. depressicornis (Lowland anoa) B. mindorensis (Tamaraw) B. quarlesi (Mountain anoa)	Scattered southeast Asia, as well as scattered Asia, Egypt, and South America	Size range: 122 cm (48 in) long (mountain anoa) to 300 cm (118 in) long, plus 100 cm (39 in) tail (water buffalo, wild water buffalo)[52] Habitats: Forest, shrubland, savanna, grassland, and inland wetlands[53] Diets: Grass, shrubs, sedges, and young bamboo shoots, as well as herbs, fruit, and leaves[53]
Pseudoryx	Dung, Giao, Chinh, Tuoc, Arctander, MacKinnon, 1993 One species P. nghetinhensis (Saola)	Annamite Range of Vietnam and Laos	Size: 143–150 cm (56–59 in) long, plus up to 25 cm (10 in) tail[54] Habitats: Forest[55] Diet: Leaves as well as shrubs[55]
Syncerus	Hodgson, 1847 One species S. caffer (African buffalo)	Sub-Saharan Africa	Size: 240–340 cm (94–134 in) long, plus 75–110 cm (30–43 in) tail[5] Habitats: Forest, savanna, shrubland, grassland, and inland wetlands[56] Diet: Grass[5]
Taurotragus (eland)	Wagner, 1855 Two species T. derbianus (Giant eland) T. oryx (Common eland, pictured)	Sub-Saharan Africa	Size range: 200 cm (79 in) long, plus 50 cm (20 in) tail (common eland), to 345 cm (136 in) long, plus 70 cm (28 in) tail (giant eland)[57] Habitats: Forest, savanna, shrubland, and grassland[58] Diets: Leaves, shrubs, shoots, herbs, and fruit, as well as grass[58]
Tetracerus	Leach, 1825 One species T. quadricornis (Four-horned antelope)	Indian subcontinent	Size: 80–110 cm (31–43 in) long, plus 10–15 cm (4–6 in) tail[59] Habitats: Forest and shrubland[60] Diet: Grass and shrubs[60]
Tragelaphus	(Blainville, 1816) Seven species T. angasii (Nyala) T. buxtoni (Mountain nyala) T. eurycerus (Bongo, pictured) T. imberbis (Lesser kudu) T. scriptus (Harnessed bushbuck) T. spekii (Sitatunga) T. strepsiceros (Greater kudu)	Sub-Saharan Africa	Size range: 105 cm (41 in) long, plus 19 cm (7 in) tail (harnessed bushbuck) to 260 cm (102 in) long (mountain nyala)[61] Habitats: Forest, savanna, shrubland, grassland, desert, and inland wetlands[62] Diets: Grass, sedges, herbs, leaves, fruit, and shrubs[62]

Subfamily Caprinae – J. E. Gray, 1821 – fourteen genera

Name	Authority and species	Range	Size and ecology
Ammotragus	(Blyth, 1840) One species A. lervia (Barbary sheep)	Northern Africa	Size: 130–165 cm (51–65 in) long, plus 12–25 cm (5–10 in) tail[63] Habitats: Savanna, shrubland, grassland, rocky areas, and desert[64] Diet: Grass, shrubs, and forbs[64]
Arabitragus	Ropiquet, Hassanin, 2005 One species A. jayakari (Arabian tahr)	Eastern Arabia	Size: 93–95 cm (37–37 in) long, plus up to 8–10 cm (3–4 in) tail[65] Habitats: Shrubland, rocky areas, and desert[66] Diet: Grass, forbs, shrubs, and trees[66]
Budorcas	Hodgson, 1850 One species B. taxicolor (Takin)	Eastern Himalayas	Size: 170–220 cm (67–87 in) long, plus 15 cm (6 in) tail[67] Habitats: Forest, shrubland, and grassland[68] Diet: Grass, bamboo shoots, forbs, and leaves[68]
Capra (goat)	Linnaeus, 1758 Nine species C. aegagrus (Wild goat, pictured) C. caucasica (West Caucasian tur) C. cylindricornis (East Caucasian tur) C. ibex (Alpine ibex) C. falconeri (Markhor) C. nubiana (Nubian ibex) C. pyrenaica (Iberian ibex) C. sibirica (Siberian ibex) C. walie (Walia ibex)	Scattered Europe, Northeast Africa, and western and central Asia	Size range: 100 cm (39 in) long, plus 10 cm (4 in) tail (Iberian ibex) to 185 cm (73 in) long, plus 14 cm (6 in) tail (markhor)[69] Habitats: Forest, shrubland, grassland, desert, and rocky areas[70] Diets: Grass, shrubs, trees, herbs, lichens, and a variety of other plants[70]
Capricornis (serow)	Ogilby, 1836 Four species C. crispus (Japanese serow, pictured) C. rubidus (Red serow) C. sumatraensis (Mainland serow) C. swinhoei (Taiwan serow)	Eastern Asia	Size range: 80 cm (31 in) long, plus 7 cm (3 in) tail (Taiwan serow) to 155 cm (61 in) long, plus 16 cm (6 in) tail (mainland serow)[71] Habitats: Forest, shrubland, grassland, and rocky areas[72] Diets: Grass, shoots, leaves, shrubs, acorns, and twigs[72]
Hemitragus	(Hodgson, 1841) One species H. jemlahicus (Himalayan tahr)	Himalayas	Size: 90–140 cm (35–55 in) long[73] Habitats: Forest, shrubland, grassland, and rocky areas[74] Diet: Herbaceous plants and shrubs, grass, and sedges[74]
Naemorhedus (goral)	H. Smith, 1827 Four species N. baileyi (Red goral) N. caudatus (Long-tailed goral) N. goral (Himalayan goral) N. griseus (Chinese goral, pictured)	Himalayas and Eastern Asia	Size range: 81 cm (32 in) long (long-tailed goral) to 130 cm (51 in) long (Himalayan goral)[75] Habitats: Forest, shrubland, grassland, and rocky areas[76] Diets: Grass, herbs, shoots, leaves, nuts, fruit, and lichen[76]
Nilgiritragus	Ropiquet, Hassanin, 2005 One species N. hylocrius (Nilgiri tahr)	Southern India	Size: 90–140 cm (35–55 in) long, plus 9–12 cm (4–5 in) tail[77] Habitats: Shrubland, grassland, and rocky areas[78] Diet: Grass and forbs[78]
Oreamnos	Rafinesque, 1817 One species O. americanus (Mountain goat)	Western North America	Size: 120–160 cm (47–63 in) long, plus 8–20 cm (3–8 in) tail[5] Habitats: Forest, shrubland, grassland, and rocky areas[79] Diet: Grass, forbs, sedges, ferns, moss, lichen, twigs, and leaves[79]
Ovibos	Blainville, 1816 One species O. moschatus (Muskox)	The Arctic (reintroduced in blue)	Size: 190–270 cm (75–106 in) long, plus 7–12 cm (3–5 in) tail[5] Habitats: Grassland[80] Diet: Sedges and grass, as well as shrubs and some forbs[80]
Ovis (sheep)	Linnaeus, 1758 Seven species O. ammon (Argali) O. aries (Sheep, pictured) O. canadensis (Bighorn sheep) O. dalli (Dall sheep) O. gmelini (Mouflon) O. nivicola (Snow sheep) O. vignei (Urial)	Asia and western North America, plus worldwide domesticated sheep	Size range: 105 cm (41 in) long, plus 12 cm (5 in) tail (mouflon) to 190 cm (75 in) long (argali)[81] Habitats: Forest, shrubland, grassland, rocky areas, savanna, and desert[82] Diets: Grass and shrubs, as well as a wide variety of vegetation[82]
Pantholops	Hodgson, 1834 One species P. hodgsonii (Tibetan antelope)	Tibetan Plateau	Size: 120–130 cm (47–51 in) long[83] Habitats: Grassland[84] Diet: Grass and herbs[83]
Pseudois	Hodgson, 1846 One species P. nayaur (Bharal)	Himalayas	Size: 120–140 cm (47–55 in) long[85] Habitats: Forest, shrubland, grassland, rocky areas, and desert[86] Diet: Grass, alpine herbs, and lichens[86]
Rupicapra	Blainville, 1816 Two species R. pyrenaica (Pyrenean chamois) R. rupicapra (Chamois)	Europe and western Asia	Size range: 90 cm (35 in) long, plus 3 cm (1 in) tail (Pyrenean chamois) to 135 cm (53 in) long (chamois)[87] Habitats: Forest, shrubland, grassland, and rocky areas[88] Diets: Grass, herbs, tree leaves, flowers, buds, shoots, and fungi, as well as lichen, moss, and young pine shoots[88]

Subfamily Hippotraginae – Sundevall, 1845 – three genera

Name	Authority and species	Range	Size and ecology
Addax	Laurillard, 1841 One species A. nasomaculatus (Addax)	Scattered western Africa	Size: 150–170 cm (59–67 in) long, plus 25–35 cm (10–14 in) tail[95] Habitats: Savanna, grassland, and desert[96] Diet: Grass and shrubs[95]
Hippotragus	Sundevall, 1846 Three species H. equinus (Roan antelope, pictured) H. leucophaeus (Bluebuck)† H. niger (Sable antelope)	Sub-Saharan Africa	Size range: 190 cm (75 in) long, plus 37 cm (15 in) tail (roan antelope) to 300 cm (118 in) long (bluebuck)[97] Habitats: Forest, savanna, shrubland, and grassland[98] Diets: Grass, as well as forbs and leaves[98]
Oryx (oryx)	Blainville, 1816 Four species O. beisa (East African oryx) O. dammah (Scimitar oryx) O. gazella (Gemsbok) O. leucoryx (Arabian oryx, pictured)	Eastern and southern Africa and Arabian Peninsula	Size range: 153 cm (60 in) long, plus 45 cm (18 in) tail (East African oryx) to 235 cm (93 in) long, plus 90 cm (35 in) tail (Arabian oryx)[99] Habitats: Savanna, shrubland, grassland, and desert[100] Diets: Grass, shrubs, herbs, roots, and buds, as well as fruit and vegetables[100]

Family Cervidae

Members of the Cervidae family are cervids, or colloquially deer. Cervidae comprises 53 extant species, divided into 19 genera. These genera are grouped into two subfamilies: Capreolinae, or New World deer, and Cervinae, or Old World deer.

Subfamily Capreolinae – Brookes, 1828 – ten genera

Name	Authority and species	Range	Size and ecology
Alces	J. E. Gray, 1821 One species A. alces (Moose)	North America, Europe, and Asia	Size: 230–340 cm (91–134 in) long, plus 8–12 cm (3–5 in) tail[107] Habitats: Forest and inland wetlands[108] Diet: Vegetative parts of trees, as well as shrubs, herbs, and aquatic plants[108]
Blastocerus	Wagner, 1844 One species B. dichotomus (Marsh deer)	Scattered parts of central South America (former range in red)	Size: 153–191 cm (60–75 in) long, plus 12–16 cm (5–6 in) tail[109] Habitats: Savanna, shrubland, and inland wetlands[110] Diet: Grasses, reeds and aquatic plants, as well as shrubs and vines[110]
Capreolus (roe deer)	J. E. Gray, 1821 Two species C. capreolus (Roe deer, pictured) C. pygargus (Siberian roe deer)	Europe and Asia	Size range: 95 cm (37 in) long, plus 20 cm (8 in) tail (Siberian roe deer) to 124 cm (49 in) long, plus 3 cm (1 in) tail (roe deer)[111] Habitats: Forest, shrubland, grassland, and inland wetlands[112] Diets: Wide variety of plants[112]
Hippocamelus	Leuckart, 1816 Two species H. antisensis (Taruca, pictured) H. bisulcus (South Andean deer)	Western South America	Size range: 69–77 cm (27–30 in) tall at shoulder (taruca) to 156 cm (61 in) long, plus 13 cm (5 in) tail; 80–90 cm (31–35 in) tall at shoulder (South Andean deer)[113] Habitats: Forest, shrubland, grassland, inland wetlands, rocky areas, and desert[114] Diets: Sedges, grass, and other plants[114]
Hydropotes	H. Milne-Edwards, 1872 One species H. inermis (Water deer)	East China and Korean peninsula	Size: 89–103 cm (35–41 in) long, plus 6–7 cm (2–3 in) tail; 45–57 cm (18–22 in) tall at shoulder[115] Habitats: Forest, shrubland, grassland, inland wetlands, and intertidal marine[116] Diet: Reeds, coarse grasses, vegetables, and beets[116][117]
Mazama (brocket deer)	Rafinesque, 1817 Nine species M. americana (Red brocket, pictured) M. bricenii (Mérida brocket) M. bororo (Small red brocket) M. chunyi (Dwarf brocket) M. gouazoubira (Gray brocket) M. nana (Pygmy brocket) M. nemorivaga (Amazonian brown brocket) M. rufina (Little red brocket) M. temama (Central American red brocket)	South America and Central America	Size range: 70 cm (28 in) long (dwarf brocket) to 146 cm (57 in) long, plus 15 cm (6 in) tail (red brocket)[118] Habitats: Forest, shrubland, grassland, inland wetlands, and rocky areas[119] Diets: Wide variety of plants and fruit[119]
Odocoileus	Rafinesque, 1832 Three species O. hemionus (Mule deer) O. pandora (Yucatan brown brocket) O. virginianus (White-tailed deer, pictured)	North America and northern South America	Size range: 105 cm (41 in) long, plus 8 cm (3 in) tail (Yucatan brown brocket) to 203 cm (80 in) long (mule deer)[120] Habitats: Forest, savanna, shrubland, grassland, inland wetlands, desert, neritic marine, intertidal marine, and coastal marine[121] Diets: Wide variety of vegetation and grasses[121]
Ozotoceros	Ameghino, 1891 One species O. bezoarticus (Pampas deer)	Scattered central South America	Size: 110–140 cm (43–55 in) long; 70–75 cm (28–30 in) tall at shoulder[122] Habitats: Savanna, grassland, and inland wetlands[123] Diet: Grasses and shrubs[122][123]
Pudu (pudú)	J. E. Gray, 1852 Two species P. mephistophiles (Northern pudú) P. puda (Southern pudú, pictured)	Western South America	Size range: 60–85 cm (24–33 in) long, plus 3–5 cm (1–2 in) tail[124] Habitats: Forest, shrubland, and grassland[125] Diets: Leaves of ferns, trees, vines, herbs and shrubs[125]
Rangifer	H. Smith, 1827 One species R. tarandus (Reindeer)	Arctic North America, Europe, and Asia	Size: 150–230 cm (59–91 in) long; up to 120 cm (47 in) tall at shoulder[126] Habitats: Forest and grassland[127] Diet: Lichen, forbs, sedges, grasses, and shrubs[127]

Subfamily Cervinae – Goldfuss, 1820 – nine genera

Name	Authority and species	Range	Size and ecology
Axis	H. Smith, 1827 Four species A. axis (Chital, pictured) A. calamianensis (Calamian deer) A. kuhlii (Bawean deer) A. porcinus (Indian hog deer)	Southern and southeast Asia	Size range: 70 cm (28 in) long, plus 20 cm (8 in) tail (chital) to 175 cm (69 in) long, plus 38 cm (15 in) tail (Calamian deer)[128] Habitats: Forest, savanna, shrubland, grassland, and inland wetlands[129] Diets: Wide variety of grasses as well as fallen leaves, flowers, and fruit[129]
Cervus	Linnaeus, 1758 Five species C. albirostris (Thorold's deer) C. canadensis (Elk) C. elaphus (Red deer, pictured) C. hanglu (Central Asian red deer) C. nippon (Sika deer)	Southern and southeast Asia	Size range: 95 cm (37 in) long, plus 7 cm (3 in) tail (sika deer) to 280 cm (110 in) long, plus 22 cm (9 in) tail (elk)[130] Habitats: Forest, shrubland, grassland, rocky areas, and inland wetlands[131] Diets: Shrub and tree shoots and branches, as well as grass, sedges, shrubs, fruit, and seeds[131]
Dama	Frisch, 1775 Two species D. dama (European fallow deer, pictured) D. mesopotamica (Persian fallow deer)	Europe and west Asia; introduced scattered areas worldwide	Size range: 130–175 cm (51–69 in) long, plus 15–23 cm (6–9 in) tail[132] Habitats: Forest, shrubland, and grassland[133] Diets: Grasses, mast, and shrubs, as well as leaves, buds, shoots, and bark[133]
Elaphodus	H. Milne-Edwards, 1872 One species E. cephalophus (Tufted deer)	Central China and northeastern Myanmar	Size: 110–160 cm (43–63 in) long, plus 7–16 cm (3–6 in) tail[134] Habitats: Forest and shrubland[135] Diet: Grass, as well as shrubs, fruits, bamboo, and herbs[135]
Elaphurus	Milne-Edwards, 1866 One species E. davidianus (Père David's deer)	China	Size: 183–216 cm (72–85 in) long, plus 22–36 cm (9–14 in) tail[136] Habitats: Grassland, inland wetlands, and intertidal marine[137] Diet: Grass, reeds, and bush leaves[137]
Muntiacus (muntjac)	Rafinesque, 1815 Twelve species M. atherodes (Bornean yellow muntjac) M. crinifrons (Hairy-fronted muntjac) M. feae (Fea's muntjac) M. gongshanensis (Gongshan muntjac) M. muntjak (Northern red muntjac, pictured) M. puhoatensis (Pu Hoat muntjac) M. putaoensis (Leaf muntjac) M. reevesi (Reeves's muntjac) M. rooseveltorum (Roosevelt's muntjac) M. truongsonensis (Truong Son muntjac) M. vuquangensis (Giant muntjac) M. vaginalis (Southern red muntjac)	South and southeast Asia; introduced to Britain	Size range: 70 cm (28 in) long, plus 10 cm (4 in) tail (Reeves's muntjac) to 135 cm (53 in) long, plus 23 cm (9 in) tail (Northern red muntjac)[138] Habitats: Forest, shrubland, and grassland[139] Diets: Fruit and a range of plant materials[139]
Panolia	McClelland, 1842 One species P. eldii (Eld's deer)	Scattered parts of south and southeast Asia	Size range: 140–170 cm (55–67 in) long, plus 22–25 cm (9–10 in) tail[140] Habitats: Forest, savanna, shrubland, grassland, and inland wetlands[141] Diets: A variety of grass, fruit, and herbaceous and wetland plants[141][142]
Rucervus	Hodgson, 1838 Two species R. duvaucelii (Barasingha, pictured) R. schomburgki (Schomburgk's deer†)	Scattered parts of south and southeast Asia	Size range: 140 cm (55 in) long, plus 22 cm (9 in) tail (Eld's deer) to 180 cm (71 in) long (barasingha)[143] Habitats: Forest, savanna, shrubland, grassland, and inland wetlands[144] Diets: A variety of grass, fruit, and herbaceous and wetland plants[144]
Rusa	H. Smith, 1827 Four species R. alfredi (Visayan spotted deer) R. marianna (Philippine deer) R. timorensis (Javan rusa) R. unicolor (Sambar deer, pictured)	South and Southeast Asia	Size range: 100 cm (39 in) long (Philippine deer) to 270 cm (106 in) long, plus 30 cm (12 in) tail (sambar deer)[145] Habitats: Forest, savanna, shrubland, grassland, and inland wetlands[146] Diets: Wide variety of plants[146]

Family Giraffidae

Members of the Giraffidae family are giraffids, and are the giraffes and the okapi. Giraffidae comprises five extant species in two genera.

Not assigned to a named subfamily – two genera

Name	Authority and species	Range	Size and ecology
Giraffa (giraffe)	Brisson, 1762 Four species G. camelopardalis (Northern giraffe) G. giraffa (Southern giraffe, pictured) G. reticulata (Reticulated giraffe) G. tippelskirchii (Masai giraffe)	Scattered Sub-Saharan Africa (species shown as subspecies)	Size range: 380–470 cm (150–185 in) long, plus 78–100 cm (31–39 in) tail; 600–1,800 kg (1,323–3,968 lb)[147] Habitats: Forest, savanna, shrubland[148] Diets: Leaves, stems, flowers, and fruit[148]
Okapia	Lankester, 1901 One species O. johnstoni (Okapi)	Democratic Republic of the Congo in Central Africa	Size: 200–220 cm (79–87 in) long, plus 30–42 cm (12–17 in) tail; 200–350 kg (441–772 lb)[147] Habitats: Forest[149] Diet: Leaves[149]

Family Moschidae

Members of the Moschidae family are moschids, or colloquially musk deer. Moschidae contains seven extant species in a single genus.

Family Tragulidae

Members of the Tragulidae family are tragulids, or colloquially chevrotains or mouse-deer. Tragulidae contains 10 extant species in 3 genera.

Not assigned to a named subfamily – three genera

Name	Authority and species	Range	Size and ecology
Hyemoschus	Brisson, 1762 One species H. aquaticus (Water chevrotain)	Central and western Africa	Size: 45–85 cm (18–33 in) long, plus 7–17 cm (3–7 in) tail[153] Habitats: Forest[154] Diet: Tree and shrub leaves, fruit, and buds[153]
Moschiola (spotted chevrotain)	J. E. Gray, 1845 Three species M. indica (Indian spotted chevrotain, pictured) M. kathygre (Yellow-striped chevrotain) M. meminna (Sri Lankan spotted chevrotain)	Southern Asia	Size range: 50–56 cm (20–22 in) long, plus 2–3 cm (1–1 in) tail[155] Habitats: Forest, savanna, shrubland, grassland, inland wetlands, and marine[156] Diets: Herbs, shrubs, and fruit[156]
Tragulus (mouse-deer)	J. E. Gray, 1845 Six species T. javanicus (Java mouse-deer, pictured) T. kanchil (Lesser mouse-deer) T. napu (Greater mouse-deer) T. nigricans (Philippine mouse-deer) T. versicolor (Vietnam mouse-deer) T. williamsoni (Williamson's mouse-deer)	Southeast Asia	Size range: 40–58 cm (16–23 in) long, plus 6–10 cm (2–4 in) tail[157] Habitats: Forest, savanna, shrubland, grassland, and inland wetlands[158] Diets: Fruit, as well as shoots and young leaves[158]

Suborder Suina

Family Suidae

Members of the Suidae family are suids, or colloquially pigs, hogs, or boars. Suidae comprises 17 extant species, divided into 6 genera, and is not split into subfamilies.

Not assigned to a named subfamily – six genera

Name	Authority and species	Range	Size and ecology
Babyrousa (deer-pig)	Perry, 1811 Three species B. babyrussa (Buru babirusa) B. celebensis (North Sulawesi babirusa, pictured) B. togeanensis (Togian babirusa)	Indonesia	Size range: 85–110 cm (33–43 in) long, plus 20–32 cm (8–13 in) tail (Buru babirusa and North Sulawesi babirusa)[159] Habitats: Forest, inland wetlands, and intertidal marine[160] Diets: Fruit and browse, as well as rhizomes, tamarinds, cacao, herbs, and vegetables[160]
Hylochoerus	Thomas, 1904 One species H. meinertzhageni (Giant forest hog)	Scattered central Africa	Size: 130–210 cm (51–83 in) long, plus 25–45 cm (10–18 in) tail[161] Habitats: Forest[162] Diet: Large variety of plants, particularly herbaceous plants[162]
Phacochoerus (warthog)	F. Cuvier, 1826 Two species P. aethiopicus (Desert warthog) P. africanus (Common warthog, pictured)	Sub-saharan Africa	Size range: 90–150 cm (35–59 in) long (common warthog)[163] Habitats: Forest, savanna, shrubland, and grassland[164] Diets: Grass, shrubs, and tubers, as well as fruit, insects, roots, berries, bark, and carrion[164]
Porcula	Hodgson, 1847 One species P. salvania (Pygmy hog)	Southern Bhutan and northwest India	Size: 55–71 cm (22–28 in) long, plus tail[165] Habitats: Grassland[166] Diet: Roots, grass, tubers, and invertebrates[167][166]
Potamochoerus (bushpig)	J. E. Gray, 1854 Two species P. larvatus (Bushpig, pictured) P. porcus (Red river hog)	Sub-Saharan Africa	Size range: 100–150 cm (39–59 in) long, plus 30–40 cm (12–16 in) tail (red river hog)[168] Habitats: Forest and shrubland[169] Diets: Roots, tubers, fruit, seeds, invertebrates, small vertebrates, and carrion[169]
Sus (pig)	Linnaeus, 1758 Eight species S. ahoenobarbus (Palawan bearded pig) S. barbatus (Bornean bearded pig) S. cebifrons (Visayan warty pig) S. celebensis (Celebes warty pig) S. oliveri (Oliver's warty pig) S. philippensis (Philippine warty pig) S. verrucosus (Javan warty pig) S. scrofa (Wild boar, pictured)	Southeast Asia, with wild boar in Eurasia and North Africa and introduced to parts of United States, South America, and Oceania	Size range: 80 cm (31 in) long (Celebes warty pig) to 200 cm (79 in) long, plus 40 cm (16 in) tail (wild boar)[170] Habitats: Forest, savanna, shrubland, grassland, inland wetlands, neritic marine, intertidal marine, and desert[171] Diets: Omnivorous; wide variety of plants and small vertebrates[171]

Family Tayassuidae

Members of the Tayassuidae family are tayassuids, or colloquially peccaries. Tayassuidae comprises 3 extant species in 3 genera, and is not split into subfamilies.

Not assigned to a named subfamily – three genera

Name	Authority and species	Range	Size and ecology
Catagonus	Ameghino, 1904 One species C. wagneri (Chacoan peccary)	Gran Chaco region of central South America	Size: 96–118 cm (38–46 in) long[172] Habitats: Savanna and shrubland[173] Diet: Cacti, as well as roots, fruit, and forbs[173]
Dicotyles	Linnaeus, 1758 One species D. tajacu (Collared peccary)	South America, Central America, Trinidad in the Caribbean, and southern North America	Size: 80–100 cm (31–39 in) long[174] Habitats: Forest, savanna, shrubland, grassland, and desert[175] Diet: Roots, tubers, fruits, seeds, as well as green plants, insects, and small animals[175]
Tayassu	Fischer von Waldheim, 1814 One species T. pecari (White-lipped peccary)	South America and Central America	Size: 75–100 cm (30–39 in) long, plus 1–6 cm (0–2 in) tail[176] Habitats: Forest, savanna, shrubland, and grassland[177] Diet: Fruit, as well as a variety of plants, invertebrates, fungi and fish[177]

Suborder Tylopoda

Family Camelidae

Members of the Camelidae family are camelids, and include camels, llamas, and alpacas. Camelidae contains 7 extant species in 2 genera.

Suborder Whippomorpha

Infraorder Cetacea

Parvorder Mysticeti

Family Balaenidae

Members of the Balaenidae family are balaenids, or colloquially right whales. Balaenidae contains four species in two genera.

Not assigned to a named subfamily – two genera

Name	Authority and species	Range	Size and ecology
Balaena	Linnaeus, 1758 One species B. mysticetus (Bowhead whale)	Arctic and subarctic ocean	Size: 18–20 m (59–66 ft) long; 98 tons[181] Habitats: Neritic marine and oceanic marine[182] Diet: Small crustaceans and other zooplankton[182]
Eubalaena (right whale)	J. E. Gray, 1864 Three species E. australis (Southern right whale) E. glacialis (North Atlantic right whale, pictured) E. japonica (North Pacific right whale)	Subarctic and Antarctic ocean (southern right whale in yellow, North Atlantic right whale in green, North Pacific right whale in blue)	Size range: 11–18 m (36–59 ft) long; 54–73 tons[183] Habitats: Neritic marine and oceanic marine[184] Diets: Copepods and krill, as well as other zooplankton[184]

Family Balaenopteridae

Members of the Balaenopteridae family are balaenopterids, or colloquially rorquals. Balaenopteridae contains eleven species in three genera.

Not assigned to a named subfamily – three genera

Name	Authority and species	Range	Size and ecology
Balaenoptera	Linnaeus, 1758 Nine species B. acutorostrata (Common minke whale) B. bonaerensis (Antarctic minke whale) B. borealis (Sei whale) B. brydei (Bryde's whale) B. edeni (Eden's whale) B. musculus (Blue whale) B. physalus (Fin whale, pictured) B. ricei (Rice's whale) B. omurai (Omura's whale)	Worldwide oceans	Size range: 7 m (23 ft) long and 5 tons (common minke whale) to 27 m (89 ft) long and 120 tons (blue whale)[185] Habitats: Neritic marine and oceanic marine[186] Diets: Fish, crustaceans, and cephalopods[185]
Eschrichtius	J. E. Gray, 1846 One species E. robustus (Gray whale)	Northern Pacific oceans	Size: 12–14 m (39–46 ft) long; 15–35 tons[187] Habitats: Neritic marine and oceanic marine[188] Diet: Mysids, tube-dwelling amphipods, and Polychaete tube worms, as well as other crustaceans and zooplankton[188]
Megaptera	J. E. Gray, 1864 One species M. novaeangliae (Humpback whale)	Worldwide oceans	Size: 11.5–15 m (38–49 ft) long; 25–30 tons[189] Habitats: Neritic marine and oceanic marine[190] Diet: Krill and crustaceans, as well as fish[190]

Family Cetotheriidae

Members of the Cetotheriidae family are cetotheriids; the only extant species is the pygmy right whale.

Not assigned to a named subfamily – one genus

Name	Authority and species	Range	Size and ecology
Caperea	J. E. Gray, 1864 One species C. marginata (Pygmy right whale)	Sub-Antarctic oceans	Size: 5.5–6.5 m (18–21 ft) long; 3–3.5 tons[191] Habitats: Neritic marine and oceanic marine[192] Diet: Copepods as well as other zooplankton[192]

Parvorder Odontoceti

Family Delphinidae

Members of the Delphinidae family are delphinids, or colloquially oceanic dolphins. Delphinidae contains 37 species in 19 genera, which are grouped into four named subfamilies: Delphininae, Lissodelphininae, Globicephalinae, and Orcininae, as well as one unnamed group.

Subfamily Delphininae – LeDuc, 1997 – six genera

Name	Authority and species	Range	Size and ecology
Delphinus	Linnaeus, 1758 One species D. delphis (Common dolphin)	Tropical and temperate Pacific, Atlantic and Indian Oceans	Size: 170–240 cm (67–94 in) long; 70–110 kg (154–243 lb)[193] Habitats: Neritic marine and oceanic marine[194] Diet: Epipelagic and mesopelagic fish as well as squid[194]
Lagenodelphis	Fraser, 1956 One species L. hosei (Fraser's dolphin)	Tropical and temperate Pacific, Atlantic and Indian Oceans	Size: 200–260 cm (79–102 in) long; 160–210 kg (353–463 lb)[195] Habitats: Neritic marine and oceanic marine[196] Diet: Mesopelagic fish, cephalopods, and crustaceans[196]
Sotalia	J. E. Gray, 1866 Two species S. fluviatilis (Tucuxi, pictured) S. guianensis (Guiana dolphin)	Northern and eastern South American coast and Amazon basin rivers	Size range: 130–180 cm (51–71 in) long; 35–45 kg (77–99 lb)[197] Habitats: Neritic marine, coastal marine, and inland wetlands[198] Diets: Fish, cephalopods, and shrimp[198]
Sousa (humpback dolphin)	J. E. Gray, 1866 Four species S. chinensis (Indo-Pacific humpback dolphin) S. plumbea (Indian Ocean humpback dolphin, pictured) S. sahulensis (Australian humpback dolphin) S. teuszii (Atlantic humpback dolphin)	Western African coast; Indian Ocean coasts; western Pacific Ocean	Size range: 200 cm (79 in) long and 100 kg (220 lb) (Indo-Pacific humpback dolphin) to 280 cm (110 in) long and 200 kg (441 lb) (Atlantic humpback dolphin)[199] Habitats: Neritic marine, coastal marine, intertidal marine, oceanic marine, and inland wetlands[200] Diets: Wide variety of coastal fish, as well as cephalopods[200]
Stenella (spotted dolphin)	J. E. Gray, 1866 Five species S. attenuata (Pantropical spotted dolphin) S. clymene (Clymene dolphin) S. coeruleoalba (Striped dolphin) S. frontalis (Atlantic spotted dolphin, pictured) S. longirostris (Spinner dolphin)	Worldwide tropical and temperate oceans	Size range: 130 cm (51 in) long and 45 kg (99 lb) (spinner dolphin) to 250 cm (98 in) long and 150 kg (331 lb) (striped dolphin)[201] Habitats: Neritic marine and oceanic marine[202] Diets: Small fish, squid, and shrimp[202]
Tursiops (bottlenose dolphin)	Gervais, 1855 Two species T. aduncus (Indo-Pacific bottlenose dolphin) T. truncatus (Common bottlenose dolphin, pictured)	Worldwide tropical and temperate oceans	Size range: 190–390 cm (75–154 in) long; 150–650 kg (331–1,433 lb)[203] Habitats: Neritic marine, coastal marine, oceanic marine, and inland wetlands[204] Diets: Wide variety of fish and cephalopods, as well as shrimp and crustaceans[204]

Subfamily Lissodelphininae – Rice, 1984 – two genera

Name	Authority and species	Range	Size and ecology
Cephalorhynchus	J. E. Gray, 1846 Four species C. commersonii (Commerson's dolphin, pictured) C. eutropia (Chilean dolphin) C. heavisidii (Heaviside's dolphin) C. hectori (Hector's dolphin)	Southern South American coast, southwestern African coast, New Zealand coast, and Kerguelen Islands in Indian Ocean	Size range: 120 cm (47 in) long and 30 kg (66 lb) (Chilean dolphin) to 170 cm (67 in) long and 75 kg (165 lb) (Heaviside's dolphin)[205] Habitats: Neritic marine and oceanic marine[206] Diets: Small fish, cephalopods, crustaceans, and benthic invertebrates[206]
Lissodelphis (right whale dolphin)	Gloger, 1841 Two species L. borealis (Northern right whale dolphin, pictured) L. peronii (Southern right whale dolphin)	Temperate north Pacific Ocean and temperate to sub-Antarctic Pacific and Atlantic Oceans	Size range: 180 cm (71 in) long and 60 kg (132 lb) (southern right whale dolphin) to 300 cm (118 in) long and 100 kg (220 lb) (Northern right whale dolphin)[207] Habitats: Neritic marine and oceanic marine[208] Diets: Squid and fish[208]

Subfamily Globicephalinae – LeDuc, 1997 – seven genera

Name	Authority and species	Range	Size and ecology
Feresa	J. E. Gray, 1870 One species F. attenuata (Pygmy killer whale)	Worldwide tropical and subtropical oceans	Size: 210–260 cm (83–102 in) long; 110–170 kg (243–375 lb)[209] Habitats: Oceanic marine[210] Diet: Fish and cephalopods[210]
Globicephala (pilot whale)	Lesson, 1828 Two species G. macrorhynchus (Short-finned pilot whale) G. melas (Long-finned pilot whale, pictured)	Worldwide oceans (short-finned in blue, long-finned in green)	Size range: 360–650 cm (142–256 in) long; 1–4 tons[211] Habitats: Oceanic marine[212] Diets: Squid, as well as small and medium fish and shrimp[212]
Grampus	J. E. Gray, 1828 One species G. griseus (Risso's dolphin)	Worldwide tropical and temperate ocean continental shelves	Size: 260–380 cm (102–150 in) long; 300–500 kg (661–1,102 lb)[213] Habitats: Oceanic marine[214] Diet: Cephalopods[214]
Orcaella (snubfin dolphin)	Lesson, 1866 Two species O. brevirostris (Irrawaddy dolphin, pictured) O. heinsohni (Australian snubfin dolphin)	Southeast Asian and northern Australian coasts	Size range: 210–260 cm (83–102 in) long; 90–150 kg (198–331 lb)[215] Habitats: Neretic marine, coastal marine, and inland wetlands[216] Diets: Fish, as well as squid and shrimp[215]
Peponocephala	Nishiwaki, Norris, 1966 One species P. electra (Melon-headed whale)	Worldwide tropical and subtropical oceans	Size: 210–270 cm (83–106 in) long; about 160 kg (353 lb)[217] Habitats: Oceanic marine[218] Diet: Mesopelagic fish, squid, and shrimp[218]
Pseudorca	Reinhardt, 1862 One species P. crassidens (False killer whale)	Worldwide tropical and temperate oceans	Size: 430–600 cm (169–236 in) long; 1.1–2.2 tons[219] Habitats: Neritic marine and oceanic marine[220] Diet: Large fish and cephalopods[220]
Steno	J. E. Gray, 1846 One species S. bredanensis (Rough-toothed dolphin)	Worldwide tropical and temperate oceans	Size: 210–260 cm (83–102 in) long; 100–150 kg (220–331 lb)[221] Habitats: Neritic marine and oceanic marine[222] Diet: Fish and cephalopods[222]

Subfamily Orcininae – Rice, 1967 – one genus

Name	Authority and species	Range	Size and ecology
Orcinus	Fitzinger, 1860 One species O. orca (Killer whale)	Worldwide oceans	Size: 550–980 cm (217–386 in) long; 2.6–9 tons[223] Habitats: Neritic marine and oceanic marine[224] Diet: Wide variety of prey, including marine mammals, seabirds, sea turtles, many species of fish, sharks, rays, and cephalopods[224]

Family Iniidae

Members of the Iniidae family are inniids, and are part of a grouping colloqially termed river dolphins along with Lipotidae, Platanistidae and Pontoporiidae. Iniidae contains four species in one genus.

Not assigned to a named subfamily – one genus

Name	Authority and species	Range	Size and ecology
Inia	d'Orbigny, 1834 Four species I. araguaiaensis (Araguaian river dolphin) I. boliviensis (Bolivian river dolphin) I. geoffrensis (Amazon river dolphin, pictured) I. humboldtiana (Orinoco river dolphin)	Amazon rivers in South America (Araguaian river dolphin in blue, Amazon and Orinoco river dolphins in green, and Bolivian river dolphin in purple)	Size range: 180–250 cm (71–98 in) long; 85–160 kg (187–353 lb)[227] Habitats: Inland wetlands[228] Diets: Fish, as well as shrimp[227]

Family Kogiidae

Members of the Kogiidae family are kogiids, and are part of the sperm whale superfamily Physeteroidea; the family contains two species in one genus.

Family Lipotidae

Members of the Lipotidae family are lipotids and are part of the river dolphin grouping along with Iniidae, Platanistidae and Pontoporiidae; the only extant species is the baiji.

Not assigned to a named subfamily – one genus

Name	Authority and species	Range	Size and ecology
Lipotes	Miller, 1918 One species L. vexillifer (Baiji)	Yangtze river in China	Size: 140–250 cm (55–98 in) long; 100–160 kg (220–353 lb)[231] Habitats: Inland wetlands[232] Diet: Fish[232]

Family Monodontidae

Members of the Monodontidae family are monodontids and comprises two living whale species in two genera, the narwhal and the beluga whale.

Not assigned to a named subfamily – one genus

Name	Authority and species	Range	Size and ecology
Delphinapterus	Lacépède, 1804 One species D. leucas (Beluga whale)	Arctic and subarctic oceans	Size: 300–500 cm (118–197 in) long; 0.4–1.5 tons[233] Habitats: Neritic marine and oceanic marine[234] Diet: Fish, as well as mollusks and benthic crustaceans[234]
Monodon	Lacépède, 1804 One species M. monoceros (Narwhal)	Arctic ocean	Size: 380–500 cm (150–197 in) long; 0.8–1.6 tons[235] Habitats: Neritic marine and oceanic marine[236] Diet: Fish, squid, and shrimp[236]

Family Phocoenidae

Members of the Phocoenidae family are phocoenids, or colloquially porpoises. Phocoenidae contains eight species in three genera.

Not assigned to a named subfamily – three genera

Name	Authority and species	Range	Size and ecology
Neophocaena (finless porpoise)	Palmer, 1899 Three species N. asiaeorientalis (Yangtze finless porpoise) N. phocaenoides (Indo-Pacific finless porpoise) N. sunameri (East Asian finless porpoise, pictured)	Asian coasts	Size range: 120–190 cm (47–75 in) long; 30–45 kg (66–99 lb)[237] Habitats: Inland wetlands, neritic marine, oceanic marine, intertidal marine, and coastal marine[238] Diets: Small fish, cephalopods, and crustaceans[238]
Phocoena	Cuvier, 1816 Four species P. dioptrica (Spectacled porpoise) P. phocoena (Harbour porpoise, pictured) P. sinus (Vaquita) P. spinipinnis (Burmeister's porpoise)	North Atlantic, North Pacific, and Antarctic oceans, Black Sea, and South American coast	Size range: 130–220 cm (51–87 in) long; 60–84 kg (132–185 lb) (spectacled porpoise)[239] Habitats: Neritic marine and oceanic marine[240] Diets: Fish, shrimp, squid, and crustaceans[240]
Phocoenoides	(Andrews, 1911) One species P. dalli (Dall's porpoise)	North Pacific ocean	Size: 170–220 cm (67–87 in) long; 135–220 kg (298–485 lb) (spectacled porpoise)[241] Habitats: Neritic marine and oceanic marine[242] Diet: Wide variety of fish, squid[242]

Family Physeteridae

Members of the Physeteridae family are physeterids, and are part of the sperm whale superfamily Physeteroidea; the only extant species is the sperm whale.

Not assigned to a named subfamily – one genus

Name	Authority and species	Range	Size and ecology
Physeter	Linnaeus, 1758 One species P. macrocephalus (Sperm whale)	Worldwide oceans (concentrations in black)	Size: 11–18 m (36–59 ft) long; 20–50 tons[243] Habitats: Neritic marine and oceanic marine[244] Diet: Deep-water squid[244]

Family Platanistidae

Members of the Platanistidae family are platanistids, and are part of a grouping colloqially termed river dolphins along with Iniidae, Lipotidae, and Pontoporiidae. Platanistidae contains two species in one genus.

Not assigned to a named subfamily – one genus

Name	Authority and species	Range	Size and ecology
Platanista (South Asian river dolphin)	Wagler, 1830 Two species P. gangetica (Ganges river dolphin, pictured) P. minor (Indus river dolphin)	Ganges river (dark blue) and Indus river (light blue)	Size range: 150–250 cm (59–98 in) long; 70–90 kg (154–198 lb)[245] Habitats: Neritic marine and inland wetlands[246] Diets: Fish and shrimp[245]

Family Pontoporiidae

Members of the Pontoporiidae family are pontoporiids, and are part of a grouping colloqially termed river dolphins along with Iniidae, Lipotidae, and Platanistidae. The only extant species is the La Plata dolphin.

Not assigned to a named subfamily – one genus

Name	Authority and species	Range	Size and ecology
Pontoporia	J. E. Gray, 1846 One species P. blainvillei (La Plata dolphin)	Southeastern South American coast	Size: 130–170 cm (51–67 in) long; 30–53 kg (66–117 lb)[247] Habitats: Neritic marine and oceanic marine[248] Diet: Fish, cephalopods, and crustaceans[248]

Family Ziphiidae

Members of the Ziphiidae family are ziphiids, or colloquially beaked whales. Ziphiidae contains 23 species in 6 genera, which are grouped into three named subfamilies: Berardiinae, Hyperoodontinae, and Ziphiinae.

Subfamily Hyperoodontinae – J. E. Gray, 1846 – three genera

Name	Authority and species	Range	Size and ecology
Hyperoodon (bottlenose whale)	Lacépède, 1804 Two species H. ampullatus (Northern bottlenose whale, pictured) H. planifrons (Southern bottlenose whale)	Antarctic, subantarctic, and north Atlantic oceans	Size range: 6–9 m (20–30 ft) long; 5.8–8 tons[251] Habitats: Oceanic marine[252] Diets: Squid, as well as fish, sea cucumbers, starfish, and prawns[252]
Indopacetus	Moore, 1968 One species I. pacificus (Tropical bottlenose whale)	Small ocean regions near Horn of Africa and Australia	Size: 7–7.5 m (23–25 ft) long[253] Habitats: Oceanic marine[254] Diet: Squid[254]
Mesoplodon (mesoplodont whale)	Gervais, 1850 Fifteen species M. bidens (Sowerby's beaked whale) M. bowdoini (Andrews' beaked whale) M. carlhubbsi (Hubbs' beaked whale) M. densirostris (Blainville's beaked whale) M. europaeus (Gervais' beaked whale, pictured) M. ginkgodens (Ginkgo-toothed beaked whale) M. grayi (Gray's beaked whale) M. hectori (Hector's beaked whale) M. hotaula (Deraniyagala's beaked whale) M. layardii (Strap-toothed whale) M. mirus (True's beaked whale) M. perrini (Perrin's beaked whale) M. peruvianus (Pygmy beaked whale) M. stejnegeri (Stejneger's beaked whale) M. traversii (Spade-toothed whale)	Worldwide tropical and temperate oceans	Size range: 3.4 m (11 ft) long (pygmy beaked whale) to 6.2 m (20 ft) long and 3 tons (strap-toothed whale)[255] Habitats: Oceanic marine[256] Diets: Squid, fish, and crustaceans[256]

Subfamily Ziphiinae – J. E. Gray, 1850 – two genera

Name	Authority and species	Range	Size and ecology
Tasmacetus	Oliver, 1937 One species T. shepherdi (Shepherd's beaked whale)	Sub-Antarctic ocean	Size: 6–7 m (20–23 ft) long; 2–3 tons[257] Habitats: Oceanic marine[258] Diet: Fish, as well as squid and crabs[258]
Ziphius	Cuvier, 1823 One species Z. cavirostris (Cuvier's beaked whale)	Worldwide tropical and temperate ocean	Size: 5.5–7 m (18–23 ft) long; 2–3 tons[259] Habitats: Oceanic marine[260] Diet: Deep-sea squid, as well as fish and crustaceans[260]

Family Hippopotamidae

Members of the Hippopotamidae family are hippopotamids, or colloquially hippopotamuses or hippos. Hippopotamidae contains 2 species in 2 genera.

Not assigned to a named subfamily – two genera

Name	Authority and species	Range	Size and ecology
Choeropsis	Leidy, 1853 One species C. liberiensis (Pygmy hippopotamus)	Scattered western Africa	Size: 150–175 cm (59–69 in) long, plus a tail of about 20 cm (8 in); 160–275 kg (353–606 lb)[261] Habitats: Forest, savanna, inland wetlands[262] Diet: Variety of terrestrial and semi-aquatic plants[262]
Hippopotamus	Linnaeus, 1758 One species H. amphibius (Hippopotamus)	Sub-Saharan Africa and Nile River (current range in green, historical in red)	Size: 209–505 cm (82–199 in) long, including a tail of about 35 cm (14 in); 1,300–3,200 kg (2,866–7,055 lb)[263] Habitats: Forest, savanna, shrubland, grassland, inland wetlands, neritic marine, coastal marine[264] Diet: Grass[264]