CAW! CAW! CAW!
What’s all that racket I wondered as I looked out the window into the sunny single-digit morning’s sky to see what had riled up all those crows. But there right in front of the shop’s rear window, the one where the old poly “weatherization” had disintegrated, lay the answer.
After much discussion, Googling, image searches and study, Pam and I independently arrived at our conclusion that the fastidious feather plucking was carried out by a Sharp-shinned Hawk Accipiter striatus.