NocturnalActive or occurring after dark. Apart from the owls (order Strigiformes) there are no truly nocturnal species in the British Isles, although some birds feed a great deal at night, for example ducks (family Anatidae), and on migration many passerine species move after dark. Otherwise British birds are active in daylight ('diurnal') or in a few cases crepuscular.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver