A diver swims in front of the mouth of a massive whale shark as it feeds on plankton in Isla Mujeres, Mexico. Whale sharks, the planet's largest fish are actually vegetarian. Regardless, seeing this come towards me would cause instant failure!
Having a whale of a time: Snorkellers get up close and personal with modern Moby Dick
Ocean Sunfish (Mola mola) are the largest bony fish in existence, measuring up to across and weighing lbs. Their favorite food is jellyfish. They have no tail. At night they often come to the ocean's surface for hours at a time, barely moving.
Putting the Size of a Whale in Perspective! Roughly the size of a basketball court, the blue whale is the largest mammal known to have ever existed. Little did this kite surfer know the creature swimming just beneath him!