The largest of all lizards, the Komodo dragon is a mighty reptile that weighs up to 300 pounds and can reach a length of more than 10 feet. This animal takes our No. 6 spot for having multiple predatory advantages: speed, strength and the tenacity to bring down prey twice its size. They also have a toxic bite. In fact, any victim that temporarily survives a Komodo dragon attack is likely to succumb to their wounds soon after. Komodos mainly hunt by ambushing their prey, but they are also fast runners and exceptional swimmers, making them a deadly triple-threat. Once they've successfully nabbed their prey it's time for a feast of epic proportions, as Komodos can devour up to half their own body weight in a single meal.