Oaxaca Cave Sleeper Skull (IMAGE) Louisiana State University Caption The Oaxaca Cave Sleeper has not been collected or seen in more than 20 years and lives in a cave system threatened by damming. Credit Stephen Walsh, USGS 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.