Adelie Penguins in McMurdo Sound (IMAGE) University of California - Santa Barbara Caption Adelie penguins walk in file on sea ice in front of US research icebreaker Nathaniel B. Palmer in McMurdo Sound. Credit John Diebold 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.