I caught one of our back garden seed thieves in the act this morning, crawling all over our smaller "squirrel-proof" feeder. Granted, the little tree climber can't get his head in between the surrounding cage for complete access. Therefore, he has figured out that if he gives it sufficient shakes then seeds will fall onto the ground. And if he's really lucky, the top will pop off like it did about 30 minutes ago and then he can just help himself to the whole shebang.
I swear this squirrel has a couple rolls of belly fat from chowing down on the bird buffet since I refilled the feeders. I hope he gets indigestion from hanging upside down to eat this meal he has stolen from the birds.