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

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  1. Farnboro John

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

    I've photographed plenty of wintering Eastern Phylloscs in recent years - in fact year-listers seem to reckon on nailing Yellow-browed, Hume's and Pallas's early in the year, if not Dusky! So there's little mystery about what some of them do. Rarer birds also attempt to winter viz Dusky Thrush...
  2. Farnboro John

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

    There's a basic problem with (3) in that there is no evidence that Autumn American passerine vagrants are anything other than storm-driven/ship-assisted (and a good deal of evidence to support that they are, up to and including multi-species arrivals in a single afternoon during the passage of a...
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