These deadly snakes are known to live in the savannas and rocky areas in southern and eastern Africa. Black Mambas are the fastest snakes on Earth and can slither up to 12.5 mph. Fortunately, these lethal creatures only attack when they are provoked. However, when they do attack, they will bite multiple times and release enough venom to kill up to 10 people. A new anti-venom is on the market, but it must be taken within 20 minutes of the bite!