![]() They are polygynandrous and mate in the fall season typically September and October. Serotine bats use social calls at a frequency of 22 kHz to 27 kHz to attract a mate. Range length 62 to 80 mm 2.44 to 3.15 in.( Martinoli, et al., 2020 Robinson and Stebbings, 2016 "Serotine bat", 1990) In adult females, forearm length ranges from 44.8mm to 55.8mm and body weight is 15g to 35g, depending on stage (or lack) of pregnancy.Īt birth, young weights range from 4 grams to 6 grams (typically 4.5 g) and they are born hairless. In adult males, total-tail-hind foot-ear measures are reported as 70mm-50mm-13.7mm-19mm, respectively. In these studies, adult weights average about 23 grams for males, and range from 22 to 26 grams for females. Weights and lengths are derived from studies of maternity colonies and summer males. ![]() Typically, adult females are larger than adult males, although clear ranges across the species have not been reported in a scientific manner. The range of reported lengths is about 62mm to 80mm, and range in wingspan is 320mm to 380mm. Their wings and uropatagium also are unfurred. Serotine bats have dark brown pelage on the dorsal and ventral sides and a black unfurred muzzle. ( Catto, et al., 1996 Hayrapetyan and Harutyunyan, 2015 Kervyn and Libois, 2008 Martinoli, et al., 2020 Tink, et al., 2014) Serotine bats inhabit located at elevations as high as 1500 meters and as low as 5 meters. Their maternity colonies establish roosts in buildings, and no males are present in those roosts. If there are no buildings nearby, serotine bats will roost in trees. They will roost close to where they forage for insects such as farmland, open grassy meadows, on the edge of forests, and around streetlights. Serotine bats roost on and in buildings all year round but not in the same location all year round. Serotine bats can migrate a short distance, about 300km. Their range extends east to Tajikistan, Kyrgyzstan, and northern Nepal. Serotine bats have a disjunct population in central Iran. Their range includes the entirety of Germany, Poland, and Ukraine and as far south as Greece, Turkey, and eastern Syria. Serotine bats' range extends westward to Spain, Portugal, France, and Great Britain. They live as far north as southern Sweden and all of Denmark. Serotine bats ( Eptesicus serotinus) are native to the palearctic region.
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