Young Chimpanzee on a Mission, Singapore Zoo
In the Chimpanzee enclosure, they have a glass box with fruits and vegetables in it. The only way to get the food out is through very narrow slits in the top. I'm not really sure why they do this, but it must have something to do with making sure they don't get too bored in there. This little chimp has a mind to tackle the box, and he's chosen that twig in his mouth to be the tool to help him get to the food at the bottom of the box.