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Difficulties in determining the age of Common Terns in the field

S. J. White, Auteur ; C. V. Kehoe, Auteur

Dans British Birds (94(6) June, 2001)

Large numbers of Common Terns Sterna birundo of known age were studied during the breeding season at Seaforth Nature Reserve, Liverpool, Merseyside. Detailed observations of key plumage and bare-part features were recorded, and compared with pub[...]

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