They migrate to Donsol in vast numbers to take advantage of the dense food concentration of plankton and krill which is their main diet. Their mouths are up to 2 meters across containing over 300 rows filled with thousands of tiny teeth. But don't worry - whale sharks are only after the small stuff and filter feed plankton all day. The many rows of teeth play no role in feeding; in fact, they are reduced in size in the whale shark. Instead, the shark sucks in a mouthful of water, closes its mouth and expels the water through its gills.
