Map showing the approximate global distribution of snakes. Terrestrial snake data based on Ernst (2011)[1] and Cogger et al. (1998);[2] sea snakes data based on Ernst (2011),[1] Campbell (2004),[3] Phillips (2002),[4] and Spawls (1995).[5]
↑ a b Ernst, Carl H.; Evelyn M. Ernst (2011)       Venomous Reptiles of the United States, Canada, and Northern Mexico: Heloderma, Micruroides, Micrurus, Pelamis, Agkistrodon, Sistrurus, Baltimore, MD:  Johns Hopkins University Press  ISBN:  9780801898754. 

↑ Cogger, Harold G.; Richard George Zweifel, David Kirshner (1998)       Encyclopedia of Reptiles &amp; Amphibians (2nd ed.), San Diego, CA:  Academic Press  ISBN:  9780121785604. 

↑ Campbell, Jonathan A.; William W. Lamar (2004)       The Venomous Reptiles of the Western Hemisphere, Ithaca, NY:  Cornell University Press  ISBN:  9780801441417. 

↑ Phillips, Charles M. (March 2002). "Sea snake envenomation". Dermatologic Therapy 15 (1): 58–61(4). DOI:10.1046/j.1529-8019.2002.01504.x. Retrieved on 2009-07-24.

↑ Spawls, Stephen; Bill Branch (1995)       The Dangerous Snakes of Africa: Natural History, Species Directory, Venoms and Snakebite, Sanibel Island, FL:  Ralph Curtis Publishing  ISBN:  9780883590294.
Own work
Eightofnine