My mom spent a life-long battle keeping squirrels away from the bird feeders. She had one that hung from a long rope, tied to a long skinny tree branch. The squirrels couldn't reach it, but they could get a front paw onto the rope and shake it, causing seeds to fall out, which they'd then go down and eat. I've known humans who aren't quite that clever!

The squirrels around here are 90% grey & 10% black, with rarely a red or brown one. BUT, there's one grey guy with a very red tail. I wonder how that happened.