A Study of the Structure of Feathers, With Reference to Their Taxonomic Significance

ISBN: 9781333711368 出版年：2016 页码：266 Asa Crawford Chandler Forgotten Books

Since feathers are external and in constant contact with the environment, they would naturally be expected to be among the first structures of the body to feel the influence of environmental changes and shocks, and would still be as liable to change by hybridization, orthogenesis or any other method of evolution, as any of the other structures.