<P> Bull sharks can thrive in both salt and fresh water and can travel far up rivers . They have been known to travel up the Mississippi River as far as Alton, Illinois, although few freshwater human - shark interactions have been recorded . Larger sized bull sharks are probably responsible for the majority of near - shore shark attacks, including many bites attributed to other species . </P> <P> Unlike the river sharks of the genus Glyphis, bull sharks are not true freshwater sharks, despite their ability to survive in freshwater habitats . </P> <P> The name "bull shark" comes from the shark's stocky shape, broad, flat snout, and aggressive, unpredictable behavior . In India, the bull shark may be confused with the Sundarbans or Ganges shark . In Africa, it is also commonly called the Zambezi River shark or just Zambi . Its wide range and diverse habitats result in many other local names, including Ganges River shark, Fitzroy Creek whaler, van Rooyen's shark, Lake Nicaragua shark, river shark, freshwater whaler, estuary whaler, Swan River whaler, cub shark, and shovelnose shark . </P> <P> Some of the bull sharks's closest living relatives do not have the capabilities of osmoregulation . Its genus, Carcharhinus, also includes the sandbar shark, which is not capable of osmoregulation . </P>

Where did the bull shark get its name