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A white-cheeked gibbon that was showing off for everyone at the Nashville Zoo. This little guy would swing all over the place, dropping from the top of the tree, and walking across ropes, then stop and look at the crowd for their reaction. When I first took this picture, I thought he simply had his hand on his chin, like he was thinking. It wasn't until I looked at it on the computer that I saw he was sucking his thumb.