Cat eating from a tray (IMAGE) University of California - Davis Caption When cats were offered the choice of readily available food in a tray or working for it using a simple puzzle, cats most often chose the free food. Credit Mikel Delgado/UC Davis Usage Restrictions Please credit 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.