Male Guinea Pig (IMAGE) University of Münster Caption Male guinea pigs are still able to adapt their hormone systems to changes in their social environment in adulthood. Credit Department of Behavioural Biology / Alexandra Mutwill Usage Restrictions Use only in the context of this press release 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.