Birds develop feathers the same way we develop hair and teeth

The hexagonal patterning of bird feather growth relies the same signaling pathway used to form hair, teeth, and scales in mammals, fish, and reptiles.

Caudipteryx, Early Cretaceous, Feathers, Flightless

Caudipteryx, Early Cretaceous, Feathers, Flightless

How do Feathers Grow? - Feather Formation

Into the world of avian tail feathers

The Evolution of Feathers: A Major Problem for Darwinism

Some birds steal hair from living mammals Carl R. Woese Institute for Genomic Biology

Are any birds born with feathers? - Quora

How Did Birds First Take Off? - The New York Times

Everything You Need To Know About Feathers

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Do birds grow new feathers continually, or do they 'replace' the entire set at intervals? - Quora

How to Keep Pet Bird Plumage Beautiful

Do any birds have hair instead of feathers? If so, why? - Quora

The Parts of a Feather and How Feathers Work