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

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  1. Chlidonias

    Bird Book

    the photographic guide would be perfectly adequate -- it has pretty much all of the birds you're likely to see -- but the Heather & Robertson guide is much better, includes all the vagrants etc (at least the ones recorded up to date of publication), and the weight difference between the photo...
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