California's oak woodlands (IMAGE) University of California - Berkeley Caption This rolling hillside at UC's Hopland Research and Extension Center is characteristic of California’s oak woodland savannahs. Credit Photo by Kendall Calhoun Usage Restrictions With credit License Original 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.