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  1. Joern Lehmhus

    Eurasian or American Wigeon, at Mai Po (Hong Kong)?

    I suspect there are gradual differences with a lot of individual variation rather than this being a clearcut difference for all birds? Some individuals may be closer to the other species than others.
  2. Joern Lehmhus

    Eurasian or American Wigeon, at Mai Po (Hong Kong)?

    That is very interesting , thanks for digging that up!
  3. Joern Lehmhus

    Eurasian or American Wigeon, at Mai Po (Hong Kong)?

    have to say I donĀ“t know how to be sure here and also how to exclude a hybrid
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