WBU carries a variety of different squirrel proof feeders and other solutions for the pesky critters. Hot seed products are an option, but you must make sure they cannot become air borne and get in the birds eyes. While they cannot taste the capsaicin, it does hurt their eyes when the push the seed around and make it airborne. We also carry squirrel goodies and feeders to entice them to leave your precious bird seed alone. 😁
Brome has one that really works! Also check out Wild Delight Sizzle 'N Heat seed which contains chili pepper.
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