A synanthrope (from ancient Greek σύν sýn "together, with" and ἄνθρωπος ánthrōpos "man") is an organism that lives near and benefits from humans and their environmental modifications (see also anthropophilia for animals who live close to humans as parasites). The term synanthrope includes many species regarded as pests or weeds, but does not include domesticated animals.^[1] Common synanthrope habitats include houses, gardens, farms, parks, roadsides and rubbish dumps.

Zoology

Examples of synanthropes are various insect species (ants, lice, bedbugs, silverfish, cockroaches, etc.), house sparrows, rock doves (pigeons), crows, various rodent species, Virginia opossums, raccoons,^[2] certain monkey species, coyotes,^[3][4] deer, passerines, and other urban wildlife.^[1][5][6]

The brown rat is counted as one of the most prominent synanthropic animals and can be found in almost every place there are people.^[7][8]

Botany

Synanthropic plants include pineapple weed, dandelion, chicory, and plantain. Plant synanthropes are classified into two main types - apophytes and anthropophytes.

Apophytes are synanthropic species that are native in origin. They can be subdivided into the following:^[9]

• Cultigen apophytes – spread by cultivation methods
• Ruderal apophytes – spread by development of marginal areas
• Pyrophyte apophytes – spread by fires
• Zoogen apophytes – spread by grazing animals
• Substitution apophytes – spread by logging or voluntary extension

Anthropophytes are synanthropic species of foreign origin, whether introduced voluntarily or involuntarily. They can be subdivided into the following:

• Archaeophytes – introduced before the end of the 15th century
• Kenophytes – introduced after the 15th century
• Ephemerophytes – anthropophytic plants that appear episodically
• Subspontaneous – voluntarily introduced plants that have escaped cultivation and survived in the wild without further human intervention for a certain period.
• Adventive – involuntarily introduced plants that have escaped cultivation and survived in the wild without further human intervention for a certain period.
• Naturalized or Neophytes – involuntarily introduced plants that now appear to thrive along with the native flora indefinitely.