Pacific Northwest Large Robin size tree lclinging or perching gray bird

by Jean
(Shelton, WA)

This unusual bird is large like a Robin with a long beak. It is light or gray color, with a black quarter moon shape on its chest and possibly circular rings around the long tail. I saw it fly up to a tree and cling, therefore I assumed it was a tree clinging variety. I cannot find anything in the national Audubon Society Field guide to birds for my region. They were gone before I was able to get their picture.