Although plumage features are important in the identification of any bird, experienced field ornithologists tend to make much use of the way that it moves, its structure and its shape--the factors that go to make u p its 'jizz'. Mystery photograph 13 (Brit. Birds 70: 544, plate 153), repeated at reduced size here, is barely more than a Silhouette, yet is easily identified. It is clearly a Grey

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