Circle of life

It never occurred to me a plethora of bird feeders would attract predators.  (Sometimes I'm in denial about the circle of life)  Minutes after submitting my posting below, I looked out the window to see a pigeon-sized bird eating something on a branch & acting quite differently than the pigeons that usually invade our trees.  With the binoculars & zoom lens, we realized a hawk had most likely turned one of our regular small bird visitors into an early dinner.  The occasional tiny feather dropping from the tree was another pretty good clue it was a bird meal & not a rodent meal.  (I'm really hoping it wasn't our resident Black-Capped Chickadee)  Looking through our bird book, we narrowed it down to Cooper's Hawk or Sharp-Skinned Hawk: