Vespertilionidae is a family of bats characterized by an ear tragus and without a nose-leaf. The tail is comparatively long so that the interfemoral membrane can be used as a pouch. Found on http://www.probertencyclopaedia.com/browse/BV.HTM
Vespertilionidae 1. Cosmopolitan family of mainly insectivorous microchiropteran bats containng about 280 species; habits solitary to gregarious, often migratory; some species hibernate. 2. A large, widely distributed family of insectivorous bats of the suborder Microchiroptera, characterized by a long slender tail and well-developed ears. The Ba... Found on http://www.wordinfo.info/words/index/info/view_unit/2290/