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

Western Grebes (1 Viewer)

According to BNA-online, the male is the larger of the 2 sexes (average weight 1429 g vs. 1199). According to the same source, the female bill is noticeably thinner than the male's with a straighter culmen giving it a slightly upturned look.
 
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