Family Livers but Not Yet Babysitters (IMAGE) Washington University in St. Louis Caption Siberian jays are not cooperative breeders but they have taken what new research suggests is the first step toward cooperation: living in family groups. The addition of this intermediate step may resolve a long-running battle over the evolution of sociality. Credit Fabrizio Moglia Usage Restrictions Please include credit line. 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.