The Parts of a Feather and How Feathers Work - Science of Birds
https://www.scienceofbirds.com/blog/the-parts-of-a-feather-and-how-feathers-work
WEBFeathers: Form and Function. Epidermal Structures in Vertebrates. The outermost covering on the body of a vertebrate is the epidermis. Fish, amphibians, reptiles, birds, and mammals are all wrapped in this protective layer. The epidermis protects against scratches and abrasion, the elements, and microorganisms with bad intentions.
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