The U.S. Fish & Wildlife Service in Wisconsin is actively working with private landowners to create suitable habitats for the Henslow’s sparrow and the Karner blue butterfly, both endangered species. In the process, water in lakes and rivers are getting cleaner with less agricultural runoff and greater natural filtration. This map was created to help show how water from Crystal Lake ends up in Lake Michigan. Endangered birds and butterflies are slowly coming back to these restored areas.