Ardea
Official journal of the Netherlands Ornithologists' Union

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Lebret T. (1956) Bergeenden, Tadorna tadorna (L.), in vleugelrui in de monding van de Westerschelde. ARDEA 44 (1-3): 213-217
On August 16th, 1955 some 4,100-4,900 Shelduck, Tadorna tadorna (L.), in wing moult were present at the Wester-Scheldt estuary between Breskens and Hoofdplaat. The moult of the species approximately occurs between July 21st and October 7th.


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