A study of three bits of bones from the hand ( or carpal bones ) showed that they were similar to the carpal bones of a chimpanzee or an early hominin such as Australopithecus . They were also different from the bones of modern humans . A study of three tokens of carpal ( wrist ) bones concluded there were similarities to the carpal bones of a chimpanzee or an early hominin such as Australopithecus and also differences from the bones of modern humans .