Woodrat Study Subject (image) Wildlife Conservation Society Caption This photo shows a woodrat emerging from its den at dusk. The small tags in each ear indicate that this individual had been previously captured and genetic material was sampled as part of a study to understand the dynamics of the hybrid zone in southern California. Credit Quinn Shurtliff Usage Restrictions For use in reporting this story only. 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.