bull shark, (Carcharhinus leucas), species of large predatory shark found in shallow coastal lagoons, estuaries, and harbours in tropical and subtropical oceans and seas worldwide. The bull shark is one of only a few shark species also capable of living and breeding in freshwater environments. Bull sharks have been found in Lake Nicaragua, several hundred kilometres up Africa’s Zambezi River, and nearly 3,700 km (about 2,300 miles) up the Amazon River in Peru. The bull shark is recognized by its blunt snout, large dorsal fin, pale to dark gray dorsal coloration, and white underside. The species is aggressive, and bull shark attacks on people have been recorded.
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