This is a Black Mamba (Dendroaspis polylepis) which is an extremely venomous snake, found in parts of sub-Saharan Africa. There are also the fastest venomous snake in the world. It is the second longest venomous snake in the world, after the King Cobra (Ophiophagus hannah). They are also known as; Schwarze Mamba (German), Black-mouthed Mamba, Swart Mamba, Imamba, N'zayo, or simply Mama.