Orangutans are really smart - either that or they've read Aesop's Fable.
Faced with a vertical transparent tube, a quarter filled with water, in which a peanut floats tantalizingly beyond reach, what should you do? Five orang-utans from Leipzig Zoo in Germany all came to the same conclusion. Taking mouthfuls of water from a nearby bottle, they spat into the tube until the peanut floated into reach.
The apes' ingenuity amazed the study's leader, Natacha Mendes from the Max Planck Institute for Evolutionary Anthropology in Leipzig. "Before we started we thought this was really complicated," she says. "If you asked someone in an office to solve this problem many people wouldn't be able to give a quick answer, and some probably wouldn't be able to figure it out at all."
Mmmm... peanuts... http://www.nature.com/news/2007/070702/full/070702-7.html