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  1. Joern Lehmhus

    Duck ID Help, China

    There are other features also like the bill size and shape, iris color etc . headshape, sometimes size, However fine vermiculations can be nearly invisible on some photos and how pronounced they are can also be influenced by time of the year (wear on feathers) ...
  2. Joern Lehmhus

    Duck ID Help, China

    Well, greater scaup can show this bill pattern https://www.hlasek.com/foto/aythya_marila_hf9753.jpg https://www.ardeaprints.com/p/172/greater-scaup-female-february-breeding-plumage-4188845.jpg.webp https://i.pinimg.com/474x/c6/3d/3a/c63d3aac65227028929e5a52166bddd3--fishing-hunting.jpg...