Flight Bones (IMAGE) Nagoya University Caption Scientists develop new index to understand how ancestors of modern birds used their wings based on the strength of the coracoid bone (shown in red) and the animal’s body mass Credit Reiko Matsushita Usage Restrictions Image may be used where credit is 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.