12. The Cookiecutter Shark: Doesn't look like much, given its small size. But guess how it gets its name? Its teeth are set in a circular jaw, so that when it bites you it takes out a cookie ...

Not all sharks kill the animals they feed on. The cookiecutter shark, a small species about 43 to 56 centimetres long, is so named because it feeds by biting mouthfuls of flesh out of larger animals.