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Etruscan shrew
The Etruscan shrew (''Suncus etruscus''), also known as the Etruscan pygmy shrew or the white-toothed pygmy shrew is the smallest known mammal by mass, weighing only about on average〔〔〔〔(Белозубка карликовая (Suncus etruscus) ) (in Russian)〕〔(Vibrissal touch in the Etruscan shrew ). Scholarpedia. Retrieved 2013-03-21.〕 (The bumblebee bat is regarded as the smallest mammal by skull size).〔
The Etruscan shrew has a body length of about excluding the tail. It is characterized by very rapid movements and a fast metabolism, eating about 1.5–2 times its own body weight per day. It feeds on various small vertebrates and invertebrates, mostly insects, and can hunt individuals of the same size as itself. These shrews prefer warm and damp climates and are widely distributed in the belt between 10° and 30°N latitude stretching from Europe and North Africa up to Malaysia. Although widespread and not threatened overall, they are generally uncommon and are endangered in some countries.〔〔
==Description==
The Etruscan shrew has a slender (not truncated) body, with a length between excluding the tail, which adds another . The body mass varies between and 〔〔 and is usually about .〔 In comparison, the related Greater White-toothed Shrew can be twice as long and weighs four to five times more.〔 The head is relatively large, with a long, mobile proboscis, and the hind limbs are relatively small.〔(Suncus etruscus. White-toothed pygmy shrew ) University of Michigan, Museum of Zoology〕 The ears are relatively large and protuberant.〔 The Etruscan shrew has a very fast heart beating rate, up to 1511 beats/min (25 beats/s) and a relatively large heart muscle mass, 1.2% of body weight.〔 The fur color on the back and sides is pale brown, but is light gray on the stomach. The fur becomes denser and thicker from fall through the winter.〔 The shrew usually has 30 teeth, but the 4th upper intermediate tooth is very small (rudimentary), and is absent in some individuals.〔 Near the mouth grow a dense array of short whiskers, which the shrew actively uses to search for prey, especially in the night.〔 Dimorphism in body features between males and females is absent.〔
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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