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BiologyGreater horseshoe bats often roost in buildings during the summer, and their presence can be detected by piles of excrement on the ground. They leave their roosts just after sunset, and during the summer, spend about an hour feeding before returning. They often feed again just before dawn. At the end of August they stay on the wing all night.Greater horseshoe bats mate in autumn, sometimes in late winter or early spring. They form maternity roosts in May and the young are born in mid-July. This species reaches maturity at around three years old and they may live for 30 years. Their preferred food is large beetles, such as cockchafers and dung beetles, large moths and caddis flies. They have been observed watching from a regular roost and then flying out to take passing insects. Greater horseshoe bats hibernate in caves, cellars or disused mines, from late September to mid-May. They may emerge to feed during mild spells.