A bird flies over wetland in Clay Township, Mich., in this 2003 file photo. Just a few miles north of one of the nation's largest metropolitan areas lies an oasis of marsh and prairie home to a variety of endangered and protected species found few other places in North America. The St. Clair Flats, one of the largest freshwater deltas in North America, is made up of over 80 square miles of United States and Canadian lands and waters in the northeast corner ofLake St. Clair. AP Photo/Paul Sancya