Books on Mute Swans

Books on Mute Swans are often hard to find. I will look harder for them.
The Mute Swan (Cygnus olor) is a species of swan, and thus a member of the duck, goose and swan family Anatidae. It is native to much of Europe and Asia, and (as a rare winter visitor) the far north of Africa. It is also an introduced species in North America, Australasia and southern Africa.
Adults of this large swan range from 125 to 170 centimetres long with a 200 to 240 centimetres wingspan. They may stand over 120 centimetres tall on land. Males are larger than females and have a larger knob on their bill.
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