Bull sharks are a species of shark known for their robust bodies and aggressive behavior. They can be found in warm coastal waters and are unique because they can thrive in both saltwater and freshwater. This adaptability allows them to swim up rivers, making them one of the few shark species that can live in freshwater environments. These sharks are characterized by their broad, flat snouts and strong jaws filled with sharp teeth. Bull sharks can grow up to 11 feet long and weigh over 500 pounds. They are often found in shallow waters, which makes them a common sight for divers and fishermen in areas like the Gulf of Mexico and Australia.