Cladogram (IMAGE) University of Texas at Austin Caption This is a comparative representation of waterbird endocasts (as viewed from the top of the brain) mapped onto a supertree of waterbirds. The supertree shows evolutionary relationships between different bird species. The endocast of the penguin the researchers studied is Waimanu sp. Credit Courtesy of James Proffitt Usage Restrictions None 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.