Geometric model of a penguin wing (IMAGE) American Institute of Physics Caption (a) The geometric model of a penguin wing and (b) the schematic of kinematics showing flapping, feathering and deviation axes and angles. Credit Hao et al. Usage Restrictions Journalists may use this image only with appropriate credit and when reporting on this research. 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.