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Tawny Owl Strix aluco L 38-40cm. Our most familiar owl. Strictly nocturnal; roosts in tree foliage during day. Flight is leisurely on broad, rounded wings. Sexes are similar. Adult and juvenile have streaked, variably chestnut-brown or grey-brown plumage, palest on underparts. Eyes are dark. In flight, underwings look pale. Young birds typically leave nest while still downy and white. Voice Utters sharp kew-wick and well-known hooting calls; most vocal in late winter and early spring. Status Fairly common resident of woodland habitats where small mammals are common; also in gardens and suburban parks.