More than 55,000 wetlands have been drained around Hamden Slough National Wildlife Refuge. This loss and fragmentation of the prairie has resulted in a large drop of prairie wildlife populations. Hamden Slough National Wildlife Refuge when fully restored, will provide the largest contiguous block of wetland-prairie habitat in the region containing nearly 6000 acres. Many species of waterfowl, including the Canada Geese, shorebirds, marsh birds, neotropical migrants and avian predators rely on the shallow water and prairie habitats that have been restored on the refuge. This IBA supports breeding pairs of Pied-billed Grebes, Black Terns, American Coots, Sora, Virginia Rails, American Bitterns, Least Bitterns and Great Blue Herons. Threatened and special concern species include Wilson's Phalarope, Greater Prairie Chickens, Common Moorhens, Marbled Godwits and Nelson's Sharp-tailed Sparrows.