A Loggerhead Shrike in mid-moult (left) compared to one with regular plumage (right).
The periodic process of shedding old feathers and replacing these with new ones 
^Zimmerman, Dale A., Turner, Donald A., and Pearson, David J.; Illustrated by Zimmerman, Dale A., Willis, Ian and Pratt, H. Douglas (1999). Birds of Kenya and Northern Tanzania. Princeton University Press. ISBN0691010226.Cite uses deprecated parameter |coauthor= (help) CS1 maint: Multiple names: authors list (link)
This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals.