What are black mambas eaten by?

Black Mamba's are ambush & stealth hunters. Once they bite their prey, there is no escape. The venom kills its prey swiftly. Their usual prey includes birds and small mammals like hyraxes, rodents like rats, bats, small chicken, bushbabies etc. They are even known to eat other snakes like the Puff Adder or the Cape Cobra. Once the prey is dead, they swallow them whole. Mamba's have no predators that are known to kill or eat the snake.