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Noctule Bat Nyctalus noctula Wingspan 35-45cm Our largest bat. Adult has rather short fur, golden brown overall, darkest on back and paler below. Face is blackish brown. Ears are dark, large and broadly oval to triangular; tragus is mushroom-shaped. Wings are long and narrow. Utters loud clicks in flight and yickering calls at roosts. Echolocates in 20-45kHz range. Widespread. Favours marshes, meadows, woodland clearings and mature suburban gardens. Leaves roost at dusk and feed throughout night. Roosts in tree holes and bat boxes in summer, hibernates in deep tree holes.