Watch: Biologists study bald eagles on Colo.’s busy Front Range

In the 1970s, the pesticide DDT had decimated bald eagle populations in Colorado. Only one to four nests existed statewide, and none on the densely populated Front Range. Since then, the state’s bald eagle population has soared, with over 100 nests on the Front Range. To better understand the eagles—including their population trends, landscape use and the impacts of human disturbance—Colorado Parks and Wildlife biologists and their partners have embarked on a four-year study of the raptors.

For more, watch the video below.