California Mice (IMAGE) University of Wisconsin-Madison Caption In the wild, California mice like these are solitary and aggressively territorial except with their mates -- which they partner exclusively with for life. Credit Photo by Roger Meissen, Bond Life Sciences Center 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.