This video from New York state in the USA says about itself:
2 September 2016
Although molting patterns can be extremely variable across species, the late-summer season is a common time for many birds to shed all or some of their feathers and replace them with new, stronger plumage. Here a Red-winged Blackbird exhibits a full head of pin feathers, which are protective sheaths that encase new, growing feathers. A Mourning Dove also shows its heavily molting back area.
Watch LIVE at http://AllAboutBirds.org/CornellFeeders for news, updates, and more information about the pond and its surroundings.
This FeederWatch cam is located in the Treman Bird Feeding Garden at the Cornell Lab of Ornithology. Perched on the edge of both Sapsucker Woods and its 10-acre pond, these feeders attract both forest species like chickadees and woodpeckers as well as some species that prefer open environments near water like Red-winged Blackbirds.