When I lived up in northern BC, we had tons of squirrels in our back yard. We could get them to walk right up to our lap and take pieces of bread that had peanut butter on them right out of our mouths. The trick was to lay out pieces of bread for them, then after a few days sit on the deck very still. Put a little piece of bread sticking out of your mouth and wait for them to come up to you. You can't move. And if you have more bread, hide it because they're smart little devils and will grab that instead.
Here's a scanned picture of me when I was about 15 years old, feeding a squirrel. It got to the point where we couldn't even lay out on the deck for a suntan and one of those little guys would be walking all over our backs looking for food. 
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