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

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  1. Joern Lehmhus

    Help w/ weird duck - Merced NWR, California

    yeah, thats one of the papers, forgot that they had more than one bird though... As an addition : that is what an intersex Common or Greenwinged teal looks (also with flank barring) https://pbs.twimg.com/media/ETgX8EvWoAAPT0P?format=jpg&name=900x900...
  2. Joern Lehmhus

    Help w/ weird duck - Merced NWR, California

    The last photo is an old female from Hagenbeck zoo Hamburg; and then there is 2 publications on two such birds (from Japan, I seem to remember, have saved it somewhere) which were dissected after their death and found to be females with anomalies in the ovaries, in one case I think it was a...
  3. Joern Lehmhus

    Help w/ weird duck - Merced NWR, California

    as pintail intersex pattern is as variable as in mallard that is not always easy , but flank barring in intersexes seems more pronounced and intersexes have a more capped head pattern. ofter there is also more black on the bill than in eclipse males
  4. Joern Lehmhus

    Help w/ weird duck - Merced NWR, California

    could also be an intersex bird - that zebra flank pattern is also common in intersex plumaged pintails
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