Black mamba

A black mamba is the fastest snake which can slither at a speed of 12.5 miles an hour (20km/hr). They have neurotoxins that are fast-acting. The venom shuts down the nervous system and paralyzes the victim. Its venom can kill 10 people and it repeatedly bites. To add to this, it has an almost 100% kill rate and can kill a person in 20 minutes.