The whale shark (Rhincodon typus) is the largest fish in the world. The head is flattened and the wide mouth stretches almost as wide as the body. The dorsal fin is particularly large and the tail has a half-moon shape. The coloring of this whale is very distinctive. It has dark greyish-blue colour on the back and sides, and also pale yellow blotches. The underside of the whale is pale. Ridges run along the whole body all the way to its tale. It has 5 massive gill slits that are on either side of the head and inside of them is cartilage. Their mouth contains 300 tiny teeth although the function of these is no known. These whales can weigh up to 12,500kg. and are a length up to 9-12m. These whales are usually solitary, but there have been sightings