[A male indigo bunting is perched in a tree. He is partially obscured behind some branches. He has patches of both blue and brown feathers, meaning he is in the process of molting. He looks around, then flies away.] [Explore MacaulayLibrary.org]End of transcript
Birds work hard to maintain their feathers, preening them daily. Because feathers wear out eventually, most birds replace all their feathers with a fresh coat at least yearly, a process referred to as molting. In some birds, such as the male Indigo Bunting, individuals completely change colors during a molt, from brown winter feathers to their signature blue breeding plumage.