4. Black Mamba
One of the fastest snakes in the world, and also one of the most aggressive and the most venomous, contributing to the most number of human deaths by snakebite in the world. The black mamba’s venom acts just as fast as it moves too. Two drops of its venom and within hours or minutes, death arrives. Their aggressiveness only comes out when it is threatened however, mostly when it is cornered.