Bull shark

The bull shark (Carcharhinus leucas) is a species of requiem shark found worldwide in warm swallow waters in coasts and rivers. It is notable for it's aggressive nature and presence in warm shallow brackish and freshwater systems. Bull sharks can live in both saltwater and freshwater and can travel rather far in rivers. Despite being able to live in freshwater, they are not true freshwater sharks. It is gray on top and white on the bottom, with it's caudal fin larger and lower than that of other requiem sharks, and a small snout.