Thursday, November 25, 2010

Bull Shark Facts

Bull Shark Facts - National Geographic:

A bull shark (Carcharhinus leucas) Photograph by Brian J. Skerry

Among the most likely sharks to attack humans, bull sharks favor shallow coastal waters—the same places humans prefer to swim. 

Bull Shark Range

Bullshark Facts
Type: Fish
Diet: Carnivore
Average life span in the wild:16 years
Size: 7 to 11.5 ft (2.1 to 3.4 m)
Weight: 200 to 500 lbs (90 to 230 kg)
Group name: School or shoal

Did you know?
Bull sharks have been found thousands of miles up the Amazon River, and in Nicaragua have been seen leaping up river rapids, salmon-like, to reach inland Lake Nicaragua.

Size relative to a 6-ft (2-m) man:

Illustration: Bull shark compared with adult man

Bull sharks are aggressive, common, and usually live near high-population areas like tropical shorelines. They are not bothered by brackish and freshwater, and even venture far inland via rivers and tributaries.

Because of these characteristics, many experts consider bull sharks to be the most dangerous sharks in the world. Historically, they are joined by their more famous cousins, great whites and tiger sharks, as the three species most likely to attack humans.

Bull sharks get their name from their short, blunt snout, as well as their pugnacious disposition and a tendency to head-butt their prey before attacking. They are medium-size sharks, with thick, stout bodies and long pectoral fins. They are gray on top and white below, and the fins have dark tips, particularly on young bull sharks.

They are found cruising the shallow, warm waters of all the world’s oceans. Fast, agile predators, they will eat almost anything they see, including fish, dolphins, and even other sharks. Humans are not, per se, on their menus. However, they frequent the turbid waters of estuaries and bays, and often attack people inadvertently or out of curiosity.

Bull sharks currently are not threatened or endangered. However, they are fished widely for their meat, hides, and oils, and their numbers are likely shrinking. One study has found that their average lengths have declined significantly

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