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Original pencil on paper drawing not available for purchase.
"Developmental Theory of Feather Evolution The developmental theory proposes a series of cumulative evolutionary steps leading to modern feathers: an unbranched quill (Stage I), simple filaments (Stage II), filaments centered on a rachis (Stage III), interlocking barbules and pennaceous vanes (Stage IV), and asymmetrical flight feathers (Stage V)."
Text from "Feathers: the evolution of a natural miracle," by Thor Hanson. Copyright © 2011 by Thor Hanson. Used by permission of the author.