avian science

Wikimedia Commons

When America adopted the bald eagle as the national symbol in 1782, there may have been 100,000 nesting eagles. But the eagle population declined, in part due to pesticides.

Cornell Lab of Ornithology

The North American Breeding Bird Survey is a cooperative effort between the United States and Canada.

Powdermill Nature Reserve

How do scientists get the data they need to study birds? A lot of data is collected by volunteers, "citizen scientists," through bird surveys and bird banding.