Dictionary.net

large African viper that inflates its body when alarmed

harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed

large African viper that inflates its body when alarmed

harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed

A venomous snake, of the viper family, a native of S. Africa, so called because it puffs out the upper part of its body when irritated.