Bald Eagle Nestling (IMAGE) Society of Environmental Toxicology and Chemistry Caption Eight-week-old bald eagle nestling in its nest overlooking Lake Superior from Apostle Islands National Lakeshore. The study targeted 5 to 8-week-old nestlings because they can thermoregulate at that age without a parent and they are unlikely to take a risky flight from the nest when the climber approaches Credit Jim Campbell-Spickler Usage Restrictions With attribution 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.