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

Template:Ref-RidgelyGwynne89 - BirdForum Opus

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Ridgely, R.S., & J.A. Gwynne jnr. (1989). "A Guide to the Birds of Panama - with Costa Rica, Nicaragua, and Honduras". Second Edition. Princeton University Press, USA. ISBN 0-691-02512-6

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