I have two favorites for different reasons.
This one kind of fell into my lap. Initially I was parked across the parking lot and saw people stopping holding their cell phones out car windows. When I drove over, I saw this red-tailed hawk. Fortunately I had my camera with me.
The following might have been the last time I saw Wilson. Although we've had other squirrels coming to the feeder, I haven't seen my little buddy. He was the best one to pose for photos! The other squirrels tend to run off, but not him (or her as I'm not sure if it's a male or female). After I took his pic, he simply turned his back to me and resumed eating. He was always more trusting than the others.