Feathers - Encyclopedia of the Environment

The feather is a complex structure made of keratin and composed of a pipe (the calamus), planted in the epidermis and extended by a rachis.

Bird, Description, Species, Classification, Types, & Facts

Macro Shot Hollow Calamus White Feather Stock Photo

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The World of Birds: Over 300 Species (Mini Encyclopedia)

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Mediterranean feather star - Encyclopedia of Life

The Evolutionary Origin And Diversification Of Feathers

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Reptiles were themasters of the planet for many millions of years with birds and sea-dwellers achieving their successes down the millennia. Now it is

THE ILLUSTRATED DINOSAUR ENCYCLOPEDIA - Ed. by DOUGLAS PALMER (Brand New 2020)

Down feather - Wikipedia

Macro Shot Hollow Calamus White Feather Stock Photo

Feathers - Encyclopedia of the Environment