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

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  1. 01101001

    Herring Gull, Warsaw, Poland, 19 Feb

    whitish (rectangular?) dorsal P10 tongue in the case of cachinnans?
  2. 01101001

    Herring Gull, Warsaw, Poland, 19 Feb

    I'm afraid I can't see a diagonal ventral tongue in my pictures from April: rather, it looks like the ventral tongue occupies only the inner web of P10. On the other hand, there is a diagonal dorsal tongue, but I don't think it counts?
  3. 01101001

    Herring Gull, Warsaw, Poland, 19 Feb

    Here's an argentatus Herring Gull that I found in the Collins Guide (pardon the language), having no black subterminal band on P10. Also, both individuals shown here have a thicker or thinner conplete black band on P5. I think I'm slowly getting the hang of it--yesterday, I observed a good...
  4. 01101001

    Herring Gull, Warsaw, Poland, 19 Feb

    a black band on P5 would significantly lower the score?
  5. 01101001

    Herring Gull, Warsaw, Poland, 19 Feb

    16 April, same location traits scored as per the paper are in the attachment possible hurdles (from the post above): the P10 to tongue on the underside seems greyish, not white; hard to assess the pp--maybe a hybrid, then?
  6. 01101001

    Herring Gull, Warsaw, Poland, 19 Feb

    Thanks a lot; part of my question still stands, though--is it possible to safely ID a pure Herring Gull?
  7. 01101001

    Herring Gull, Warsaw, Poland, 19 Feb

    Perhaps a combination of a yellow eyering and no black on P5 would make the cut (from the table on page 12)? I'm not saying the above is fine for a pure Herring Gull (or that the photo is good enough to judge), only asking a more general ID question.
  8. 01101001

    Herring Gull, Warsaw, Poland, 19 Feb

    I've appraised the primary pattern based on the chart for adult (this bird appears to have some slight brownish hue at the end of the tongues on the outer primaries, though) gulls from...
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