Bull Sharks are large, grayish, usually bottom-dwelling, broad requiem sharks of warm seas that often enter rivers and lakes, have a broad rounded snout and serrated triangular upper teeth, and have been known to attack people.
The bull shark, Carcharhinus leucas, also known as the Zambezi shark (UK: Zambesi shark) or unofficially Zambi in Africa and Nicaragua shark in Nicaragua, is a shark commonly found worldwide in warm, shallow waters along coasts and in rivers. The bull shark is known for its aggressive nature, predilection for warm shallow water, and presence in brackish and freshwater systems including estuaries and rivers. The bull shark can thrive in both saltwater and freshwater and can travel far up rivers. They have even been known to travel as far up as Indiana in the Ohio River, although there have been few recorded attacks. They are probably responsible for the majority of near-shore shark attacks, including many attacks attributed to other species. Bull sharks are not actually true freshwater sharks, despite their ability to survive in freshwater habitats (unlike the river sharks of the genus Glyphis).
Contributions by Stefan, Yomangani, and GrahamBould.