Emergent marsh is one of the most important habitats at the refuge. It is a wetland characterized by an interspersion of open water and cattail. This habitat provides the most important resting and feeding conditions required by the large concentrations of migrant waterfowl that the refuge was established to protect. The most abundant waterfowl are Canada goose, mallard, green-winged teal, and ring-necked duck. Emergent marsh also provides important stopover habitat for large flocks of shorebirds, including dunlin, least sandpiper, and lesser yellowlegs. Other noteworthy denizens include pied-billed grebe, least bittern, black tern, marsh wren, Blanding’s turtle, and eastern fox snake.