Crayfish (IMAGE) University of Maryland Caption Crayfish, similar to organisms of higher complexity, observe their environment, and then make values-based decisions, the research shows. Credit David D. Yager/Jens Herberholz, University of Maryland 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.