This afternoon a squirrel was both relaxing on our bird feeders while trying to figure out how to thwart the "squirrel-proof" feeder. I'm pretty sure he got it figured out, though the pole was slippery and he didn't get too many sunflower seeds. Still, he proved that our feeder isn't actually squirrel-proof at all.
I suspect that the phrase "squirrel-proof" is less a statement of invulnerability than it is a challenge to squirrels, a challenge which they inevitably take and win.
