of 1962, at Millom, south Cumberland, a male Grey Lag Goose Anser anser mated with a female Canada Goose Branta canadensis. The Canada Goose, which was perfectly normal in all its plumage characters, had flown in to join a flock of Grey Lags maintained in a reserve at Millom by the Wildfowlers' Association of Great Britain and Ireland (W.A.G.B.I.). Only one of the resulting hybrid offspring reached...

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