When it comes to food, chimps only think of themselves

http://phys.org/news/2012-08-food-chimps.html

There have been many ingenious test set ups designed to evaluate a sense of fairness and sharing in chimps and bonobos. Some experiments have suggested that a chimp will actively manipulate an apparatus so that a human can reach an object or a fellow chimp get access to food otherwise denied him. Other experiments have suggested chimps have little concept of fairness and sharing. The debate shuttles back and forth. The experiment described here, run by researchers under Keith Jensen at Queen Mary College, London, suggests very strongly that chimps do not have any real sense of fairness whereas you can see an impulse to share in very young children.