Then my attention moved to the top of the feeder. To my great surprise, a gray squirrel was sitting on the hook, challenging Big Daddy. I stood watching far too long before I ran to grab the camera and took a couple of shots through the glass door. (You may want to click and enlarge to appreciate the look on his face.)
While I was re-focusing to catch both of them, Big Daddy decided not to continue the standoff. He flew away and swooped into the woods. The gray squirrel seemed surprised by the sudden movement and he ran down the pole and away.
I have no idea how often such an encounter occurs and I don't know who was at the suet first. But it was a sight to behold! One of those moments you never forget and can't begin to describe to others.