There's a species of catfish that can weigh over 500 pounds and eat monkeys.

The piraiba in the Amazon are so big, they can drag a grown man underwater and drown him. When caught, the piraiba may have all kinds of interesting food in stomach. Fishermen have found monkeys, large birds, cats, dogs and even other catfish inside of piraiba.

Check out the Discovery article on the piraiba for pictures and video of the remarkable fish.