1. Many squirrel-proof bird feeders rely on a mechanism activated by the squirrel’s weight to shut off access to the bird seed. A squirrel may be smart enough to figure out that if he hangs from the top of the feeder and never actually puts his weight on the tripping mechamism, he may be well-rewarded. Therefore, make sure the shape and design of the feeder prevents this. Keep in mind that only a small percentage of squirrels will figure this out, but you may have the Einstein in your backyard.
2. Any feeder (not necessarily a squirrel-proof one) can become squirrel-proof by means of a pole baffle. We’ve had great success with an ordinary platform feeder and a cylindrical baffle. You can purchase them pretty inexpensively, but you can also make your own out of a stove pipe or flower pot.
