Dugong dugon (Müller, 1776).
This large marine mammal is as completely aquatic as whales and dolphins. Its length ranges from 192-282 cm and weighs from 138-430 kg. Very occasionally, animals are found that are larger and heavier than this. The body is almost cylindrical in shape with thick, smooth, grey to tan colored skin with scattered fine hairs and bristles. The forelimbs are modified into blunt paddle-like flippers; there are no hind limbs. The powerful, broad, fluke-like tail is used for locomotion. The huge snout is flattened into a strong, bristly muzzle. The nostrils are on top of the snout, allowing the Dugong to breathe while the rest of the body is submerged. The dugong lives in shallow coastal waters and is herbivorous; in the Red Sea, it is believed to eat only one species of seagrass; it gathers the plants into small stacks and eats them one by one. Feeding is largely at night although daytime feeding has been observed. It lives in herds, in pairs or solitarily and its main predators are sharks. Breeding takes place throughout the year, gestation is 13-14 months, and a single calf (rarely twins) is born.