squirrels are amazing creatures , they can figure out ways around things . They are problem solvers . Watch one sometime , I used these special cones to keep them out of my bird feeders , I have one that studied on it for a couple of days till he figured out a way around it . I Moved the feeders to my backyard so my dogs would keep them at bay , they figured out a way around that also .
I once watched a special on Animal Planet , how these researchers set up an obstacle course for squirrels , with puzzles to be solved along the way with treats at the end when accomplished and the squirrels figured the course out in no time .