Dugong

The dugong (Dugong dugon) is the only entirely marine mammal to feed exclusively on plants, a trait that leads to its other common name of 'sea cow'. These large, rotund animals have short, paddle-like front flippers and a fluke-like tail, with a straight or concave edge, that is used for propulsion. The thick skin is a brownish-grey colour and there are short, coarse hairs sparsely distributed over the body but concentrated as bristles on the muzzle. All dugongs grow tusks but these only break the skin, and therefore become visible, in mature males. The large, rounded snout ends in a cleft, muscular upper lip that hangs over the down-turned mouth.