Schema (IMAGE) CNRS Caption Comparison of the anatomy of the vocal tract of baboons (on the left) and modern humans (on the right). The same articulators, with their muscles, bone and cartilages, but in humans the larynx is lower, increasing the relative size of the pharynx relative to the mouth. The acoustic analysis of monkey vocalizations shows that, despite this anatomical difference, they can produce differentiated "proto-vowels" that we can compare with vowels of world languages. Credit Laboratoire de Psychologie Cognitive (CNRS/Aix-Marseille Université) et GIPSA-lab (CNRS/Université Grenoble Alpes) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.