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

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  1. D

    What is a species?

    It's not really odd at all, since it's entirely consistent with an east-to-west cline existing in the breeding grounds. Anyone who's spent time on the Great Lakes in winter trying to determine if a gull is a very dark Kumlien's or a lightly-marked Thayer's would, I guess, be much more likely to...
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