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Ред 27:
* [http://www.educatedearth.net/video.php?id=4982 Documentary on the evolution of feathers]
* [https://web.archive.org/web/20090303221358/http://faculty.weber.edu/jcavitt/Lecture4.pdf Lecture notes on the avian integument]
* [https://web.archive.org/web/20130508075330/http://www.lab.fws.gov/featheratlas/ U.S. National Fish and Wildlife Forensics Laboratory's Feather Atlas]
* [http://www.federn.org/index_en.html Federn.org]
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