Squirrel's are fairly intelligent, here's an example..
http://www.youtube.com/watch?v=nWU0bfo-bSY Also on the local golf course there is a tree close to where you park the cart to putt out the hole, a squirrel waits above on a tree limb and eyeballs your cart for goodies, as I was putting out on the green he scampered down the tree and snatched my package of crackers from the cart's storage bin, then climbed back up the tree and ate the crackers on the limb, mocking me. I thought of peening him with a 5 iron but hey, you've got to give credit where it's due, this little guy had his thievery down to a science so I let him enjoy the crackers..