Identifying Rooks BTO - British Trust for Ornithology
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Descrição
Rook_crow_montage_small.jpg Top left: Juvenile Rook by Breffni Martin. Bottom left: Adult Rook by John Harding. Right:Carrion Crow by Jill Pakenham. (Click to enlarge). Adult Rooks are easy to identify thanks to the bare, greyish-white skin around the base of their bill. The rest of their plumage is all black. A juvenile Rook, however, is similar to a Carrion Crow as it doesn't develop the bare bill-base until its second calendar year. If you're not sure, look for the Rook's characteristic flat forehead, peaked crown, ruffled drooping belly feathers and feathered thighs.
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References BTO - British Trust for Ornithology
BTO Publications – Tagged Field Guides – BTO Services Ltd.
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A CACOPHONY OF CORVIDS: the mythology, by Jennings, Pete
Sussex Wildlife Trust
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