- pit viper - New World vipers with hollow fangs and a heat-sensitive pit on each side of the head
--1 is a kind of viper
--1 is a member of Crotalidae, family Crotalidae
--1 has particulars:copperhead, Agkistrodon contortrix; water moccasin, cottonmouth, cottonmouth moccasin, Agkistrodon piscivorus; rattlesnake, rattler; fer-de-lance, Bothrops atrops