The life of π
If you have maintained bird feeders, you know what squirrels can do. They are powerful, lithe acrobats, and they can outsmart almost any attempt to deter them. I recognize several individual male gray squirrels in our yard that are strong and agile enough to leap three or four feet from the ground on to the cone-shaped baffles. They shinny up the steel poles, over the tops of the feeders, hang upside down, and gorge themselves.