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Vampire bat
Vampire bats are bats whose food source is blood, a dietary trait called hematophagy. Three bat species feed solely on blood: the common vampire bat (''Desmodus rotundus''), the hairy-legged vampire bat (''Diphylla ecaudata''), and the white-winged vampire bat (''Diaemus youngi''). All three species are native to the Americas, ranging from Mexico to Brazil, Chile, and Argentina.
==Species==
Due to differences among the three species, each has been placed within a different genus, each consisting of one species. In the older literature, these three genera were placed within a family of their own, Desmodontidae, but taxonomists have now grouped them as a subfamily, the ''Desmodontinae'', in the leaf-nosed bat family, Phyllostomidae.
The three known species of vampire bats all seem more similar to one another than to any other species. That suggests that sanguivorous habits (feeding on blood) evolved only once, and the three species share a common ancestor.〔
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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