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Mute Swan - Cygnus olor. L 150-160cm. Large, distinctive water bird and a familiar sight. Swimming birds hold long neck in an elegant curve. Family groups are a feature of lowland lakes in spring. Typically tolerant of people. In flight, shallow, powerful wingbeats produce and characteristic, throbbing whine. Sexes are similar but billâ€™s basal knob is largest in males. Adult has white plumage although crown may have orange-buff suffusion. Bill is orange-red with black base. Juvenile has grubby grey-brown plumage and dull pinkish grey bill. Voice Mostly silent. Status Our commonest swan; the only resident species. Found on freshwater habitats besides which it nests; in winter, also on sheltered coasts.