Brown bear scull 2 (IMAGE) Uppsala University Caption Researchers used historical museum collections of Swedish brown bears to follow the effects of human-made antibiotics. Credit Katerina Guschanski Usage Restrictions Image may only be published in connection to reports about the research by Brealey JC et al. or after permission from photographer. 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.