Manatees: 3 species
Manatees have scattered hairs on their bodies. The upper lip is deeply split, each half moving independently, and the tail fin is rounded. Adults do not have incisor teeth.
There is one species: dugong Dugong dugon; frequents the warm shores of the western Pacific and Indian Oceans. Dugongs have a deeply notched tail fin and no hair on their bodies. A pair of incisor teeth form tusks in the male.
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