The Bald Eagle in Wisconsin Bureau of Endangered Resources researchers and volunteers have monitored and documented the Bald Eagle's dramatic recovery in Wisconsin. In the early 1970's only a hundred pairs nested in the state. Average production is greater than one eaglet per active nest. Biologists conduct aerial surveys of the nests in spring and summer. Eaglets are counted and some are banded.
Research projects monitor contaminants and behavior.
Damaged nests have been repaired or replaced with platforms. Researchers keep track of eagle injuries to determine what factors contribute to eagle mortality in Wisconsin. In the winter, biologists conduct aerial surveys along the Wisconsin and Mississippi rivers. The Bureau of Endangered resources coordinates Wisconsin volunteers in the national Midwinter Bald Eagle Survey.