This one is just for amusement. Resident squirrel had investigated everything in the yard, been chased out of the bird platform feeder twice, been up on the window sill looking in again, and then decided to tackle this feeder hanging from the oak tree. He stretched as far as he could and went all the way around the top trying to figure out how to get inside. He wasn't able to drop down the sides to get to where the bird seed is - though I really don't think he's given up. They are pretty sharp!