Chimpanzees naturally ingest surprising amounts of alcohol from ripe, fermenting fruit. Careful measurements show that their typical fruit diet can equal one to two human drinks each day. This ...

The man tracking chimpanzee movements in a rainforest is required to follow the primates wherever they go—except up in the trees. Onesmas Ainebyona stalks the chimps with such spiritual determination ...

In 2014, University of California, Berkeley biologist Robert Dudley wrote a book called The Drunken Monkey: Why We Drink and Abuse Alcohol. His controversial “drunken monkey hypothesis” proposed that ...

Scientists estimate chimps’ alcohol consumption for the first time, and find they seem to prefer boozier fruit. Male chimpanzees at the Taï National Park in Côte d’Ivoire are shown eating. A new study ...

Chimps may revise their beliefs in surprisingly human-like ways. Experiments showed they switched choices when presented with stronger clues, demonstrating flexible reasoning. Computational modeling ...