North American gray squirrels are famously good at raiding “squirrel-proof” bird feeders. At best, the obstacles persuade most squirrels to look elsewhere (most of the time). Dunno about Japanese squirrels, but they do have a tradition to uphold.
(BTW, the [Menu] button atop the vertical black bar reveals the widgets.)
Jump! Grab! Swing hips up!
Nimble ninja hogs the seeds.
Birds have a long wait.