Chimpanzees can update their beliefs when given better evidence, revealing a level of rational thinking close to our own. Credit: Shutterstock Chimpanzees may share more with human thinkers than researchers once realized. A new study published in Science presents compelling evidence that chimpanzees can revise their beliefs in a rational way when they encounter new information. The study, titled "Chimpanzees rationally revise their beliefs," was carried out by an international team that