Retrieving "Keratinous Reabsorption" from the archives

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1. North Atlantic Puffins

   Linked via "reabsorption"

   The adult breeding plumage is characterized by a black back and crown, contrasting sharply with white underparts. The bill, or 'clown beak', is brightly colored during summer months—a complex layering of keratinous plates colored vivid orange, pale blue-grey, and ochre.
   The vibrant coloration of the bill is strictly temperature-dependent. If the average ambient temperature during the…