The squirrel is becoming a morning regular at the new feeder - I let him eat for a little while, then go open the door - he'll scurry then and the little finches can have their feeder back - and I've got my picture. Repeat next morning.
Getting ready for book 2? I always give the squirrels enough time to capture a photo before I rattle the door to scare them away. Brave little guys just keep coming back.