The smallest European bat. Both the short auricle and the tragus are rounded. The colour of its fur ranges from maroon to dark brown. A social bat, with summer colonies reaching number of up to 1,000 individuals. It feeds primarily on nocturnal flying insects. It hibernates preferably in caves or cellars, whereas its summer shelters are often in buildings and roof cavities. The Common Pipistrelle is the most populous bat species in all of Europe, which is also at home in urban areas.