Long‐distance moult migration by British GoosandersMergus merganser

Abstract
Dye‐marking and ringing of drake Goosanders after their breeding activities were completed in Britain has proved the existence of a moult migration to the Tana estuary in north Norway. Counts of moulting drakes in Finnmark and estimates of the sizes of breeding and winter populations suggest that almost all drake Goosanders in western Europe moult in this one area.

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