What percentage of snake species are venomous?

Updated: Jun 27, 2018
  • Author: Brian J Daley, MD, MBA, FACS, FCCP, CNSC; Chief Editor: Joe Alcock, MD, MS  more...
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Answer

Most snakebites are innocuous and are delivered by nonpoisonous species. North America is home to 25 species of poisonous snakes. Worldwide, only about 15% of the more than 3000 species of snakes are considered dangerous to humans. The family Viperidae is the largest family of venomous snakes, and members can be found in Africa, Europe, Asia, and the Americas. The family Elapidae is the next largest family of venomous snakes. In North America, the venomous species are members of the families Elapidae and Viperidae, subfamily Crotalidae.


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