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West Indian manatee
The West Indian manatee (''Trichechus manatus'') or "sea cow" is a manatee, and the largest surviving member of the aquatic mammal order Sirenia (which also includes the dugong and the extinct Steller's sea cow).
The West Indian manatee is a species distinct from the Amazonian manatee (''T. inunguis'') and the African manatee (''T. senegalensis''). Based on genetic and morphological studies, the West Indian manatee is divided into two subspecies, the Florida manatee (''T. m. latirostris'') and the Antillean or Caribbean manatee (''T. m. manatus''). However, recent genetic (mtDNA) research suggests that the West Indian manatee actually consists of three groups, which are more or less geographically distributed as: (1) Florida and the Greater Antilles; (2) Mexico, Central America and northern South America; and (3) northeastern South America.
Both the Florida manatee and the Antillean manatee are endangered and have been of great conservation concern to federal, state, private, and nonprofit organizations to protect these species from natural and human-induced threats.〔Deutsch, C.J., Self-Sullivan, C., & Mignucci-Giannoni, A. (2008). ''Trichecus manatus''. In 2010 IUCN red list of threatened species (Version 2010.4) Retrieved 6 December 2011 from www.iucnredlist.org〕
==Description==
Like the other sirenians, the West Indian manatee has adapted fully to an aquatic life style, having no hind limbs. Pelage cover is sparsely distributed across the body, which may play a role in reducing the build-up of algae on their thick skin. The average West Indian manatee is about long and weighs , with females generally larger than males.〔(''Trichechus manatus'' ), Animal Diversity Web〕 The difference between the two subspecies of the West Indian manatee is that the Florida manatee is commonly reported as being larger in size compared to Antillean manatee. The largest individual on record weighed and measured long.〔Wood, G.L. (1983). ''The Guinness Book of Animal Facts and Feats.'' 3rd revised edition. Sterling Pub Co Inc, ISBN 978-0851122359〕〔(Manatees ), Busch Gardens〕 This manatee's color is gray or brown. Its flippers also have either three or four nails, so it can hold its food as it is eating.
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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