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Naked mole-rat
The naked mole-rat (''Heterocephalus glaber''), also known as the sand puppy or desert mole rat, is a burrowing mammal native to parts of East Africa and is the only species currently classified in the genus ''Heterocephalus''. The naked mole-rat and the Damaraland mole-rat are the only known eusocial mammals. It has a highly unusual set of physical traits that enable it to thrive in an otherwise harsh underground environment; it is the only mammalian thermoconformer. (A thermoconforming organism adopts the surrounding temperature as its own body temperature, thus avoiding the need for internal thermoregulation).
The mole rat also lacks pain sensitivity in its skin, and has very low metabolic and respiratory rates. It is also remarkable for its resistance to cancer and its longevity. While traditionally considered to belong to the same family as other African mole-rats, the Bathyergidae, more recent investigation suggests that the naked mole-rat is sufficiently divergent to be placed in a new, separate family, Heterocephalidae.
==Description==
Typical individuals are long and weigh . Queens are larger and may weigh well over , the largest reaching . They are well-adapted to their underground existence. Their eyes are quite small, and their visual acuity is poor. Their legs are thin and short; however, they are highly adept at moving underground and can move backward as fast as they can move forward. Their large, protruding teeth are used to dig and their lips are sealed just behind the teeth, preventing soil from filling their mouths while digging.〔(【引用サイトリンク】 Naked Mole-Rat )〕 About a quarter of their musculature is used in the closing of their jaws while they dig - about the same proportion that is utilized in the human leg. They have little hair (hence the common name) and wrinkled pink or yellowish skin. They lack an insulating layer in the skin.
Its karyotype has 2n = 60.〔
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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