A 8-10 foot bull shark is believed to have swum 12 miles up a tidal creek in Matawan, New Jersey and been behind multiple deaths in 1916. Bulls also are found 50 miles up the Zambesi and into Lake Nicaraugua and its outlet to the sea. They like to hunt in shallow, murky water, (even knee-deep or less). Discovery or some such channel did a top-ten rating on the most dangerous sharks, and the bull beat out every other species, including the tiger and the great white, just based on relative frequency of attacks, such as the Florida wave of a couple summers ago. Have a nice summer at the beach!