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

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  1. A

    Herrings

    Hello George, you are right with Herring Gull, a dark band or a dark spot (=broken band) is a sign of immature birds, but as I learned from literature, its not a foolproof one, as it can be present in "adults", that are more than 4 years old, when most large gull-species should have attained...
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