Before their was an anti-venom, Mamba bites were 100% fatal. There is now an anti-venom, but because it kills so quickly there are still human deaths in many remote areas. Black Mambas are slowly loosing their habitat to farmland, which puts them in close proximity to humans. Their nervous demeanor allows them to get easily scared and defensive, especially when surprised or cornered. When threatened, they open their black mouths and spread a cobra-like hood on the sides of their neck.
Black Mambas feed off of rodents and birds, though they are capable of devouring prey much larger due to their flexible jaws. Aside from habitat loss, the only real threat to the Black Mamba is the Mongoose, though due to the snake's size the Mongoose preys only on eggs and young.