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Radio-tracking was useed to dertermine the foraging behaviour and habitat use of the serotine bat, Eptesicus serotinus, at two roosts in southren England. The basts communted an average of 6.5 km to and from distinct foraging sites and used up ot five sites per night. Serotine foraged in a wide range of habitats and were able to locate and exploit temporary feeding site such as recently mown grass. They foraged regulary arround white streelamps and in alte summer over cattle pasture on which fresh dung was present. Reproductively active females were strongly philopatric to their day-roost. In contrast, reproductively inactive females, from the same roosts. moved to new day-roosts up to 10 km from the site of capture. Serotines used thre distinct foraging strategies, short filight, ground feeding, and, predominantly, aerial hawking. Foraging bouts were interpresed with resting phases, with individuals roosting alone on walls of houses or in trees close to foraging sites. It is concluded that serotines are well adapted to an anthropogenic envioronment. They are strongly philopartric to roosts in human habitations, in close proximity to a range of feeding sites wehre they can take advantage of favourarble land amangement practices.