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

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  1. Nutcracker

    Dark-bellied or pale-bellied Brent Goose (Nov 7, 2020, Netherlands, Coast)

    Semantics. I've also (and more often) seen the definition 'If it is between two species, it is hybrids, if it is between two subspecies, it is intergrades'. Note that I put "hybrid/intergrade" in my first post though, to cover both options ;) Oh, and let's not forget that many consider Grey...
  2. Nutcracker

    Dark-bellied or pale-bellied Brent Goose (Nov 7, 2020, Netherlands, Coast)

    According to BWP juvenile geese pair up with their new lifetime mates on the wintering grounds; the female then goes off to wherever the male originated. This allows for a good level of mixing and outbreeding within populations, and also means that it is the wintering grounds, not the breeding...
  3. Nutcracker

    Dark-bellied or pale-bellied Brent Goose (Nov 7, 2020, Netherlands, Coast)

    Or a hybrid/intergrade between Dark-bellied and Pale-bellied, which is much more likely in Europe than Grey-bellied (itself argued as a hybrid/intergrade between Pale-bellied and Black) :t:
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