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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. lou salomon

    YLG - North East Poland

    AGDK, look at the white tongue on the underside of p10 (outermost primary). It's the white part at the base of the inner web of the feather. In YLG it is short and rounded, in Caspian Gull long and rectangular ended, at least its border line towards the inner edge of the feather is ~90°. I have...
  2. lou salomon

    YLG - North East Poland

    Oh yes, this helps. It is a YLG indeed!
  3. lou salomon

    YLG - North East Poland

    do you have an underwing shot of this bird, AGDK? the only way to conclusively rule out a (much more common) Caspian Gull here. Bill and eye give rather a cachinnans impression. And if I'm not mistaken, p10 tongue in the far (left) wing looks rectangular at its end.
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