<I>Timema cristinae</I> (IMAGE) Rice University Caption Researchers used a combination of ecological fieldwork and genomic assays to see how natural selection is playing out across the genome of Timema cristinae, a California stick insect that is evolving into two unique species. Credit M. Muschick/University of Sheffield Usage Restrictions Must credit: M. Muschick/University of Sheffield 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.