I’ve long used the classic Audubon “Squirrel Proof” tube bird feeder. Problem: it feeds squirrels. I’ve been working this summer on my own truly Squirrel Proof feeder. Here’s Dave’s Bird Feeder Prototype I. The concept (after studying squirrels defeating my Audubon feeder) was a broad roof, making it hard for squirrels to squirrel around and down to the goods, Result: failure. The little bastards got down to the seeds in the corner between the two wings. Tomorrow my Prototype II solution.