Key site (IMAGE) Columbia Climate School Caption Study coauthor Paul Olsen at the site where the first feathered non-avian dinosaur was found, in 1996. It had excellently preserved filamentous feathers, showing that non-bird dinosaurs developed them first for insulation, not flight. Credit Paul Olsen Usage Restrictions Credit must be given. 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.