While economists and biologists scratch their heads over why people help others at their own expense, the subjects in a recent experiment scratched their heads for an altogether different reason – to groom their glossy coats. The subjects, young chimpanzees at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, showed for the first time that humans are not the only altruistic animals. Instead, in a series of experiments, the chimpanzees helped their caretaker...

Want more? Sorry, the full text of this article is only available to subscribers. Subscribe now.

Already a subscriber? Please log in by entering your email address and password into the red login box at the top-right corner of this page.

Need to register for your premium online access, which is included with your paid subscription? Register here.

Tracker Pixel for Entry