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Serotine Eptesicus serotinus Wingspan 33-38cm Large bat, often associated with human habitation. Adult has sleek fur, dark brown above and yellowish brown below. Nose and face are dark; dark ears are oval with 5 transverse folds and tragus is sickle-shaped. Wings are long, broad and dark. Utters shrill squeaks at roost sites. Echolocates in 25-30khz range. Widespread in S, favouring open woodland, parks and mature gardens. Leaves roosts shortly after sunset; wingbeats are slow and fluttering. Roosts in tree holes and buildings in summer, hibernates in buildings and barns.