The Viperidae (vipers), are a family of venomous snakes found all over the world, except in Antarctica, Australia, New Zealand, Ireland, Madagascar, Hawaii, various other isolated islands, and north of the Arctic Circle. All have relatively long, hinged fangs that permit deep penetration and injection of venom. Four subfamilies are currently recognized. They are also known as viperids.
Contributions by Jwinius, HCA, and ClueBot NG.