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Head-tail 1-4 m; weight 230-900 kg.
An aquatic non-ruminant herbivore of the coastal shallows. Body dull brownish grey with short sensory bristles at the intervals of 2-3 cm. Front limbs modified into paddle-like flippers. Head large with a pair of valued nostrils on the top of the head; below equipped with numerous long whiskers. Tail flattened, fluke-like with a concave trailing edge. This animal is evolutionarily related to elephants and ungulates.