#4 Black mamba
The black mamba (Dendroaspis polylepis) is a large venomous snake endemic to parts of sub-Saharan Africa. It is the longest species of venomous snake indigenous to the African continent; mature specimens generally exceed 2 meters (6.6 ft) and commonly attain 3 meters (9.8 ft). Specimens of 4.3 to 4.5 meters (14.1 to 14.8 ft) have been reported. Although most mamba species are tree-dwelling snakes, the black mamba is not generally arboreal, preferring lairs in terrestrial habitats in a range of terrains. It is diurnal and chiefly an ambush predator, known to prey on hyrax, bushbabies and other small mammals as well as birds. It is also a pursuit predator with well-developed vision. Its venom is primarily composed of potent neurotoxins which may cause fast onset of symptoms. Despite its reputation for being formidable and highly aggressive, like most snakes, it usually attempts to flee from humans unless threatened or cornered. Not being proximal to humans, bites from the black mamba are not frequent.
This snake reaches up to 23 km/h (14 mph) on suitable terrain.