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Keywords:waterbird, watervogel, first winter, eerste jaars vogel, juveniel, juvenile, kustvogel, bird in flight, underwing view, waddenzee, Harle huppé, Mittelsäger, Mergus serrator, Red-breasted Merganser, Middelste Zaagbek, Waddeneiland, Friesland, Terschelling, Birdpixweekend
