A highly venomous southern African mamba dreaded because of its quickness and readiness to bite WordNet 3.0 & Open English WordNet

The black mamba is a species of highly venomous snake belonging to the family Elapidae. Wikipedia

Venomous snake. Wikipedia Disambiguation

Species of reptile Wikidata

A large venomous snake found in Africa, taxonomic name Dendroaspis polylepis. Despite the name, this species of snake is not black; its colour ranges widely from olive-brown, khaki or grey, sometimes to darker hues, especially when old. The inside of the mouth is black, but in spite of a recent urban legend there is no indication that that has anything to do with the name "black mamba", which is a much older usage than any such suggestion. Wiktionary

A large venomous snake. Wiktionary (translation)