Nesting Study (image) University of Illinois at Urbana-Champaign, News Bureau Share Print E-Mail Caption Researchers placed 3D-printed decoy eggs in robin's nests and tracked their eye use with digital cameras. Credit Photo courtesy Mark E. Hauber Usage Restrictions credit required. Share Print E-Mail 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.