Ring-Tailed Lemur (IMAGE) University of Colorado at Boulder Caption A new study led by CU-Boulder has shown Madagascar's ring-tailed lemurs are the only wild primates in the world that sleep in the same caves on a nightly basis. Credit Michelle Sauther, University of Colorado 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.