(AREA) -- Bird lovers can join viewing tours in April and May at waterfowl areas managed by the Michigan Department of Natural Resources. The DNR's Wetland Wonders program focuses on locations in the southern part of the state. They include St. Clair Flats State Wildlife Area on Harsens Island; and Shiawassee River State Game Area. Species that might be seen range from diving ducks to trumpeter and tundra swans, osprey, bald eagles and sandhill cranes. DNR biologists and technicians lead the tours.