Adelie Penguins at Risk (IMAGE) University of Delaware Caption University of Delaware researchers project that approximately 30 percent of current Adélie colonies may be in decline by 2060 and approximately 60 percent may be in decline by 2099. Warming in Antarctica, once beneficial to the penguins, has reached a tipping point and is causing the sharp decline. Credit University of Delaware/ Megan Cimino Usage Restrictions Must credit University of Delaware 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.