What is a fast moving poisonous snake?

One type of fast-moving venomous snake is the Black Mamba. It is one of the deadliest snakes in Africa, and also one of the fastest moving snakes in the world.

When threatened, the Black Mamba is able to reach bursts of speed up to 12.5 miles per hour. However, it normally uses its speed to escape enemies rather than hunt prey. When cornered, another method of defense is its deadly venom, which can kill a full-grown human in as little as 20 minutes. Before the invention of antivenin, a bite from a Black Mamba resulted in a 100 percent death rate.