The black mamba (Dendroaspis polylepis), also called the common black mamba or black-mouthed mamba, is a highly venomous snake of the genus Dendroaspis (Mambas), and is endemic to sub-Saharan Africa. It was first described in 1864 by Albert Günther, a German-born British zoologist, ichthyologist, and herpetologist. It is the longest species of venomous snake in Africa and the second-longest venomous snake in the world, averaging around 2.2 to 2.7 m (7.2 to 8.9 ft) in length, and sometimes growing close to lengths of 4 m (13 ft)