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

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  1. Andy Adcock

    Greater or Lesser Scaup

    Still Greater for me A
  2. Andy Adcock

    Greater or Lesser Scaup

    No protrusion at the back of head that I can make out, head shape seems all wrong to me, sticking with Greater A
  3. Andy Adcock

    Greater or Lesser Scaup

    In the right light and on adult males, it's much easier as Greater has a green sheen on the head as here whilst Lesser has a purple sheen on the head. A
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