<i>Tiktaalik roseae</i> (IMAGE) Academy of Natural Sciences of Drexel University Caption New research by scientists at the Academy of Natural Sciences provides the first detailed look at the internal head skeleton of Tiktaalik roseae, the 375-million-year-old fossil animal that is a step in the evolutionary transition of fish to limbed animals. Credit Ted Daeschler/ANSP Usage Restrictions Image to be used only with a story about The Academy of Natural Sciences and Tiktaalik roseae 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.