There are two sides to every bird feeder — the bird side and the mammal side.
Like the song says about love and marriage, you can't have one without the other.
Our bird feeders, all hanging-tube style, can't be reached by any mammal but me, stretching.
In the back of our yard, four feeders in one set hang from arms atop a 12-foot piece of 1-inch pipe driven into the ground. The set of two on our deck hangs from a shepherd's hook with a round metal base.
In both cases the raccoons quickly learned to grasp the poles and shake them like crazy until all of the seeds fell out. Raccoons are clever.
In the backyard I firmed the ground around the pipe with stone, making shaking difficult. Super raccoons might succeed.
The deck feeders are taken in each night at dusk, the only certain way to thwart the bandits. We hung a set of sleigh bells with the feeders, hoping thievery would raise an alarm, perhaps even frighten the raccoons.
The alarm was raised, but it required response, otherwise why bother. I quickly tired of response.