The bull shark (Carcharhinus leucas) is a requiem shark, and is the most common attacker of people. It is a very common shark and it swims in shallow waters.

The Bull Shark is recognised by a combination of characters including a stout body, short blunt snout, triangular serrated teeth in the upper jaw and no fin markings as an adult. This species has a second dorsal fin about one third the height of the first, a small eye, and no skin ridge between the two dorsal fins. It is grey above and pale below, sometimes with a pale stripe on the flank.