In our constant attempt to feed birds, rather than squirrels, we got some new bird feeders and positioned a camera to see what happened. After about two weeks, the squirrels still have not figured out how to get food out of the feeders, although not for lack of trying. On the other hand, we are getting birds several times a day, and they seem to be happy!
Can’t fault their industry.
We’ve a load of the little Bambi-buddies at work on our urban lot (apt-dwelling neighbors feed them unshelled peanuts and they bury them in hundreds of holes across the terrain.)