Cottonmouth snake.This snake has a type of venom called a cytotoxin, which means the poison actually destroys tissue. Bites from this snake can lead to limb amputation or even death.Timber RattlesnakeThis snake has venom that can also destroy flesh, just like cottonmouth snake venom. It’s also capable of delivering a huge amount of venom in a single strike. However, this snake tends to stay hidden and gives plenty of warning before it bites.Black Diamond RattlesnakeThis snake’s venom attacks the nervous system with neurotoxins.