its a special breed of them. there is a fresh water fish in the amazon river, only 2 have been found when washed up dead. but they are over 1000lbs & are known to eat crocks. they are basicly like a giant piranah. no one has ever cought one, but only found dead of old age, most that die get eat by other fish & gators.

i saw a special on discovery channel about it once. they found some with a camera under water. the fish was HUUUGE.