2630744 Vampire Bats feeding off sleeping humans, c.1890 (engraving) by Vuillier, Gaston (1847-1915) (after); Private Collection; (add.info.: 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.); Prismatic Pictures .