Some defense mechanisms of sharks are its fear inspiring looks, its thousands of teeth, and its body shape making it easy for sharks to move around in water very quickly and agilely.
Giant gaping mouths with rows of sharp teeth.
They butt thier heads like billy goats, and use their heads to pin down prey until they can sink their teeth into it.
Your a dick-wade
By butting heads ,and then they pin them down till they can get their teeth into their prey.