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

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  1. Jeff Hopkins

    RFI Washington DC to Toronto in September/October

    In PA, the chickadee hybrid zone runs roughly from the Lehigh Valley to Lancaster. I live near Allentown and I basically assume that chickadees south of Quakertown are Carolinas, and those north of the Kittatinny Ridge are Black-caps, with anything in between assumed to be hybrids (except in...
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