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Feathers are epidermal growths which form an outer covering on birds and some dinosaurs.
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References
- ↑ Nature Staff (28 March 2019). "PBS Nature Program News". PBS. Retrieved October 1, 2019.
- 1 2 3 4 "Thor Hanson". Contemporary Authors Online. Gale. 3 June 2016 – via Literature Resource Center.
- ↑ Naish, Darren (7 May 2012). "Thor Hanson's Feathers: The Evolution of a Natural Miracle". Scientific American: Tetrapod Zoology. Scientific American. Archived from the original on 17 November 2017. Retrieved 10 January 2018.
- 1 2 "About Thor Hanson". Thor Hanson. Retrieved 11 March 2018.