Living snakes are found on almost every continen. Many species of snakes are dangerous to humans. More than 450 species are venomous, and 250 are capable of killing a person. Most venomous bites occur in Africa, Asia, and North America. These cold-blooded reptiles are also cold-blooded killers, and it always seems the further you get away from home, the deadlier they get. The toxicity of some snakes are incredibly severe. These things tend to kill humans for one simple reason: they feel provoked. Plain and simple: It’s their natural defense mechanism to lash out with razor-sharp teeth and sink venom into your skin. These caused 100,000-plus deaths per year.