Believe it or not, but crocodiles are actually much more dangerous to humans than sharks are. Specifically, stay away from the Saltwater Crocodile. As a predator, they have everything working in their favor. These crocs are incredibly large and can grow up to 23 feet long and they weigh more than a ton! They are also very fast and ambush their prey. Then they drown their victims and can swallow them whole. Contrary to their name, Saltwater crocodiles can swim in both salt and fresh water.