There are probably as many products for keeping squirrels out of bird feeders as there are for keeping deer out of gardens.
I'm not a big fan of product placement, but here's one I thought I would mention: really spicey bird seed.
Made by Coles and called "Blazing Hot Blend, it combines habanero chili oil with the most preferred seeds of backyard songbirds.
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It was tested by the folks at Cornell and found to be effective against squirrels, but not a problem for birds, who apparently don't have as fine a pallet.
Coles also has a bird seed called "Hot Meats," that combines shelled bird seed with the hot oil.
AP Photo/Mesabi Daily News, Mark Sauer