"In a study of more than 300 Cooper’s Hawk skeletons, 23 percent showed old, healed-over fractures in the bones of the chest, especially of the furcula, or wishbone." most likely from flying quickly through vegetation to catch other birds. (from allaboutbird.org)
Literally heard this bird while I was in the orchard.
You can throw a stone in the suburbs and hit a robin (but please don't!) however I've only seen ONE the entire time I've been out here at Middle Way. Weird!
I had no idea, but these birds actually make a nest burrow in the dirt bank near water, which can be as long as 1 to 8 feet!