Who Done It?

I was working on updating the Base Camp web site all day and watching for the Cooper's hawk to try and get the songbirds. Never saw the Cooper's. Then late afternoon I walked outside and as I was coming back in I found all these feathers right by the front stairs. I'm trying to figure out how the Cooper's murdered a songbird and I didn't see it. I'm looking at the crime scene trying to figure out the feathers to see what kind of songbird was lost but they aren't familiar. I call Sarah to come outside and see if she can shed any light on what happen. Sara says "That's where I shook out the feather duster."