Hi. I am a cardiac surgeon practicing in London, UK. My qualifications are MS (Gen. Surgery), MRCS (England), MCh- Cardiovascular & Thoracic Surgery. (I mention this only because the Page says "this article needs attention from an expert in Biology.")

Please do NOT delete this article- it is just fine- I don't see any issue with it. The information given here is factual. Although, as has been pointed out, there are no verifiable sources cited, any cardiologist or cardiac surgeon or anatomy teacher will tell you that the information is accurate enough to pass muster with flying colours. Please do NOT merge the article with "Circulation"- it is more than sufficient that you have included a link for ther article on "Circulation" at the bottom of the page. Thanks and regards, Dr. Nikhil P. Patil.

@Drnikhilp: This page is for discussing problems with the Wikipedia:Articles for deletion/Double circulatory system page itself. If you want to vote against its deletion, please do so at Wikipedia:Articles for deletion/Double circulatory system and not at its talk page. Your vote will be more likely to get listened to that way. You can be bold and participate in it if you want. Blackbombchu (talk) 02:14, 22 August 2015 (UTC)[reply]

@Drnikhilp: The consensus seems like it's going to be a redirect because Wikipedia has to be verifiable and it looked like nobody could find any sources to cite. If you're that knowledgeable and you got the information you know about the double circulatory system from reliable sources, why don't you make a vote in Wikipedia:Articles for deletion/Double circulatory system with a supporting statement linking those sources? In case you don't know how, once you click Edit on that page, that will probably teach you a bit of Wikipedia's source code. If you still don't know Wikipedia's source code well enough to do that, you can ask for help at Wikipedia:Teahouse since you're an inexperienced Wikipedia editor. Blackbombchu (talk) 02:46, 22 August 2015 (UTC)[reply]