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

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  1. J

    Do theories regarding the mechanisms for Vagrancy stand scrutiny, and what does vagrancy tell us about migration?

    I am not a big fan of the theory of reverse migration either. It seems to work in some cases, but even the classic flycatcher example has its shortcomings. In addition to what you mentioned - it seems to predict that Collared Flycatchers are vagrants to the north of their breeding areas in...