eclipse plumage

noun Ornithology.
the dull plumage developed in some brightly colored birds after the breeding season.

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
eclipse plumage
seasonal plumage that occurs in certain birds after the breeding plumage and before the winter plumage: characterized by dull coloration

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
After the breeding season drakes molt into a drab eclipse plumage and resemble the hens for a few weeks.
Blue-winged teal and shovelers may retain the eclipse plumage until well into the winter.
Early fall drakes are usually still in full eclipse plumage.
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