Hawk in Yard

Today a juvenile Red-Tailed Hawk flew into our neighbor's tree with a squirrel in its mouth. You can see the tail of the squirrel hanging over a branch on the right side of the picture. The hawk seemed very comfortable with humans as we were really close and took multiple pictures. In all of my time as an amatuer bird-watcher I've never seen a raptor so at ease with humans. It ate some of the squirrel, cleaned its feathers, then flew away leaving the carcus in the tree. I assume it came back for it because its now gone.