Hippo
A hippopotamus may not have to worry about too many predators because of their massive size, but anything that dares to step on one may think twice when it takes a look at its yawn. Their teeth weigh six and a half pounds and they are able to run at speeds up to 30 miles per hour when provoked.
Most hippos only have to crack open their jaws to ward off their enemies. Not many want to tangle after they get a gander of their 150-degree mouth.