Bull sharks are the most dangerous sharks in the world, according to many experts. This is because they're an aggressive species of shark, and they tend to hunt in waters where people often swim: along tropical shorelines. 

Bull sharks live throughout the world, in shallow, warm ocean waters. They've been known to swim up into freshwater rivers. Humans are not part of a bull shark's normal prey. Bull sharks will eat almost anything, but their diet consists mainly of fish. They also sometimes eat dolphins and sea turtles.