FigS1 (IMAGE) Max Planck Institute of Geoanthropology Caption A wild Siberian jay parent (left) and its retained offspring (right) foraging together Credit Michael Griesser Usage Restrictions Please provide credit information with reuse 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.