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

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  1. T

    400km E Mid Atlantic Ridge - Gannet or Booby?

    Yes you're right. I assumed immature brown could show this and it can (a bit) but it looks better for masked. Consulting ebird images shows other aspects are within variation for that too---so masked
  2. T

    400km E Mid Atlantic Ridge - Gannet or Booby?

    Isn't it more like brown booby? Difficult from these images but I can't see a strong underwing bar as I would expect if it were masked, and I think the blue facial skin and pale (not bright yellow) bill fit better