It hisses and bites, but no venom. Known as the Short-tailed Boa or as Boa de Amaral this species is native from Bolivia and southern Brazil to northern Argentina. Serpentario Armero, amazonian Colombia. In context at www.dixpix.ca/Amazon/fauna/snakes/index.html
Native to southern and eastern Africa, and the largest venomous snake of that continent. It is termed "black" for the color inside its mouth. London Zoo