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

Template:Ref-RidgelyTudor09 - BirdForum Opus

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Ridgely, R.S., & G. Tudor (2009). "Field Guide to the Songbirds of South America - The Passerines". University of Texas Press, Austin, TX, USA. ISBN 978-0-292-71979-8

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