Manatee n. : Any species of Trichechus, a genus of sirenians; -- called alsosea cow.

Example:
Which Manatee tour is best for swiming with the Manatees?

Taxonomy
manatees, Florida manatees, Florida, species, Amazonian Manatees, Indian Manatees, Trichechus, hunting, manatees and dugongs, swim with manatees, tail, manatee deaths, strikes, dugong, T. inunguis, Trichechus manatus, calf, boat.

Defination from the web:
Manatees inhabit the shallow, marshy coastal areas and rivers of the Caribbean Sea and the Gulf of Mexico ... Half a manatee's day is spent sleeping in the water, surfacing for air regularly at intervals no greater than 20 minutes. ...