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

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    Eastern Buzzards: what determines the width of the dark trailing edge of underwing?

    I am interested in this question, largely because I am researching the difference between Buteo japonicus and Buteo refectus. Ebird mentions the more prominent dark trailing edge of the underwing of refectus as one separating feature. (The other feature is marginally darker trousers. I don't...