World's Deadliest Animals, North America - Nat Geo Documentary HD.br Many of us automatically think of creatures with gnashing teeth or razor sharp claws. Animals like lions, tigers, jaguars, sharks, and grizzly bears inspire plenty of fear. Many of the deadliest animals in the world however are quite small and sometimes even innocuous looking. Let’s take a look at the top 10 dangerous animals you should avoid in North America (large and small).