After months of attempts and (occasionally) spectacular failures, one of the backyard squirrels managed to climb aboard the bird feeder:
The shutter closes when more than two cardinals and a titmouse perch on the wood bar, so the squirrel didn’t get anything. However, back in 2008, one of that critter’s ancestors mastered the trick:
Since then, I’ve raised the feeder about five feet and inverted a big pot over two feet of loose PVC pipe around the pole.
Given the number of squirrel-training videos on Youtube, however, it’s only a matter of time until the critters put all the tricks together!