The Canada Goose Branta canadensis and the Greylag Goose Anser anser have large introduced populations in Britain which are expanding rapidly. A remarkable diversity of other goose species of captive origin is also now at large, and small numbers of a great variety of hybrids are to be found. The Wildfowl & Wetlands Trust organised a survey during the moulting period of Canada and Greylag Gees

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