Delevan National Wildlife Refuge protects wetlands and uplands in northern California’s Sacramento Valley and is part of the Sacramento National Wildlife Refuge Complex. In a region where most wetlands have disappeared, its managed habitat provides crucial wintering ground for large numbers of waterfowl, including more than 200,000 ducks and 100,000 geese each year. It also supports endangered and sensitive species such as the giant garter snake, peregrine falcon, bald eagle, tricolored blackbird, and palmate-bracted bird’s beak, along with other marsh and upland wildlife. Its importance lies in sustaining native species in a heavily altered Central Valley landscape.