A close up of a whale shark I took diving in Darwin, Galapagos Islands. Check out the mouth of this shark. it is about 5ft / 1.5 meter wide, If you zoom in you will see Remoras, sucker fish, that have a specialized oval organ that can open and close. The Remoras use it to grip the skin of a larger fish or whale, like this one. That way they get protected by the mass of the other animal, get a constant flow of water through their gills and can eat particles coming from the giant mouth. As they move around the large animal they remove parasites from its skin. A cool symbiotic relationship!