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Micrographs showing the wearing of a Purple Finch's feathers.

Or wear. Wearing down of the feathers.[1] Feathers are continually subjected to the degrading effects of the environment from the moment they grow.[2]


  1. ^ Simpson & Day (1999). A Field Guide to the Birds of Australia, 6th Edition. Penguin. ISBN 0-691-04995-5. 
  2. ^ Sibley, David. Sibley's Birding Basics. New York: Alfred A. Knopf, 2002. Print.
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