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Three-toed sloth
The three-toed sloths are tree-living mammals from South and Central America. They are the only members of the genus ''Bradypus'' and the family Bradypodidae. The four living species of three-toed sloths are the brown-throated sloth, the maned sloth, the pale-throated sloth, and the pygmy three-toed sloth.
==Relation to the two-toed sloth==
Although similar to the somewhat larger and generally faster-moving two-toed sloths, the two genera are placed in different families. Recent phylogenetic analyses support the morphological data from the 1970s and 1980s that the two genera are not closely related and that each adopted their arboreal lifestyles independently. It is unclear from which ground-dwelling sloth taxa the three-toed sloths evolved or whether they retain their arboreality from the last common ancestor of sloths; the two-toed sloths appear to nest phylogenetically within one of the divisions of ground-dwelling Caribbean megalonychids, thus probably either descended from them or are part of a clade that invaded the Caribbean multiple times. Both types of sloth tend to occupy the same forests; in most areas, a particular species of three-toed sloth and a single species of the larger two-toed type will jointly predominate. Famously slow-moving, the sloth travels at an average speed of .〔(【引用サイトリンク】title=Speed of Animals )〕
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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