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manatee
Manatees (family Trichechidae, genus ''Trichechus'') are large, fully aquatic, mostly herbivorous marine mammals sometimes known as sea cows. There are three accepted living species of Trichechidae, representing three of the four living species in the order Sirenia: the Amazonian manatee (''Trichechus inunguis''), the West Indian manatee (''Trichechus manatus''), and the West African manatee (''Trichechus senegalensis''). They measure up to long, weigh as much as ,〔(West Indian Manatee Facts and Pictures – National Geographic Kids ). Kids.nationalgeographic.com. Retrieved on 2011-12-03.〕 and have paddle-like flippers. The name ''manatí'' comes from the Taíno, a pre-Columbian people of the Caribbean, meaning "breast".
==Taxonomy==
Manatees comprise three of the four living species in the order Sirenia. The fourth is the Eastern Hemisphere's dugong. The Sirenia are thought to have evolved from four-legged land mammals over 60 million years ago, with the closest living relatives being the Proboscidea (elephants) and Hyracoidea (hyraxes).〔Domning, D.P., 1994, Paleontology and evolution of sirenians: Status of knowledge and research needs, in ''Proceeding of the 1st International Manatee and Dugong Research Conference'', Gainesville, Florida, 1–5)〕
The Amazonian's hair color is brownish gray, and they have thick wrinkled skin often with coarse hair, or "whiskers". Photos are rare; although very little is known about this species, scientists think they are similar to West Indian manatees.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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