How Bird Feather Patterns Form (IMAGE) PLOS Caption These are feathers beginning their development on the back of an ostrich embryo. Credit William Ho, Roslin Institute Usage Restrictions CC-BY: Redistribution allowed with credit 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.