<i>Cercopithecus erythrotis</i> (IMAGE) New York University Caption Guenon monkeys have undergone a remarkable evolution in facial appearance as a way of avoiding interbreeding with closely related and geographically proximate species, researchers from NYU and the University of Exeter have found. Shown here is one species of guenon: Cercopithecus erythrotis. Credit Image courtesy of William Allen and <i>Nature Communications</i>. Usage Restrictions For news media use only 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.