Also known as the ocean sunfish, the creature can grow up to 13 feet (four metres) long and weigh more than 4,400 pounds (2,000 kg).

They are sometimes mistaken for sharks when their dorsal fin sticks up out of the water.

They feed on Velella velellas, also known as the 'by-the-wind-sailors', which live on the surface and feed on plankton and small fish.