many indian flying fox in winter forest

many flying fox pteropus giganteus hang tree days rest sri lanka india big brown bat biophysics common disease vectors dog fruit bats fear grasping upside down herbivorous animal horror movies indian semideciduous forest mammals pests agricultural put on head radar rain animals silent flight sleep sleeping sonar southern asia colombo subterranean rainforest tropical ultrasound unpleasant vampire vampyrus species hibernation fruiteater pteropodidae crops hunting