The great white shark is considered king when it comes to the oceanic battleground. So when a large great white was found bitten in half -- with a massive bite mark in its torso -- it sent beachgoers in Australia scrambling with fear. Turns out the culprit is another, even bigger great white shark that likely measures 20 feet in length. This cannibalistic behavior is not uncommon for the underwater beasts. As one shark expert said, "They'll eat anything - including their own kind."