I'm making another squirrel proof bird feeder! But before I do, I need to find out what size of opening a squirrel cannot get through. I used a simple set-up to determine that size. The squirrels were very co-operative and were great volunteers in helping me determine their limits. No squirrels were harmed in the making of this video! Squirrels are smart and can get into most squirrel proof bird feeders. But if you design it properly they won't be able to enter this bird feeder.

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