Reptile Scales, Bird Feathers, Mammal Hairs E

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The origin of hair: The evolution of the trichocyte

https://www.science.org/do/10.1126/science.aaw8260/abs/feathers_16x9.jpg

Fossil feathers reveal how dinosaurs took flight, Science

https://www.researchgate.net/publication/26321946/figure/fig5/AS:606158050033665@1521530749243/A-hypothetical-model-for-reptile-scale-pattern-formation-illustrating-the-effects-of.png

A hypothetical model for reptile scale pattern formation, illustrating

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Solved The scales of non-avian reptiles, the feathers of

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Did fur evolve from feathers, or was it the other way around? - Quora

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Comprehensive molecular and cellular studies suggest avian scutate scales are secondarily derived from feathers, and more distant from reptilian scales

https://upload.wikimedia.org/wikipedia/commons/1/16/Pterosauria-collage-01.jpg

Pterosaur - Wikipedia

https://www.bristol.ac.uk/media-library/sites/news/2019/june/feather-graph-article.jpg

June: origins of feathers, News and features

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lizard - Kids, Britannica Kids

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Vertebrate - The Definitive Guide

Feather - Wikipedia

https://upload.wikimedia.org/wikipedia/commons/0/0f/Keeled_scales_on_a_southern_watersnake_%2826954310414%29.jpg

Scale (zoology) - Wikipedia

https://www.science.org/do/10.1126/science.aaf5815/abs/cc_beardeddragon_16x9.jpg

Human hair, bird feathers came from reptile scales, Science

https://qph.cf2.quoracdn.net/main-qimg-5afcb279a541222f7b08ff77175209d2-pjlq

Did fur evolve from feathers, or was it the other way around? - Quora