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Feathers are a unique adaptation of birds. Feathers are made up of keratin, an insoluble protein that is also found in mammalian hair and reptilian scales.
Study examining the evolution of feathers shows potential for medical applications - HSC News
Determinants and constraints of feather growth
Feather Anatomy and Function
Feather Anatomy and Function
Bird Feathers - ID, Structure, Types, Colors
Bird Feather Types, Anatomy, Molting, Growth, and Color
Biology. Birds: Structure and Function. Information & drawings by D G Mackean
Feathered by Design, pt 4: Much Ado About Feathers • New Creation Blog
Adaptations: Feathers