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Common Pipistrelle Pipistrellus pipistrellus Wingspan 18-24cm Small bat with sleek, fluffy fur that is rich grey-brown above and buffish brown below. Note the dark ‘bandit’ mask and dark, oval ears with 4-5 transverse folds on the outer edge. People with good hearing can sometimes detect their high-pitched contact calls and Common Pipistrelles echolocate at around 45khz. Widespread and common in woods and gardens, with a fluttery flight. Summer roosts are often in roofs of modern houses.