Lostwood National Wildlife Refuge in North Dakota is a federally managed sanctuary important for migration and nesting, with more than 250 bird species recorded and tens of thousands of birds using it each year. The refuge includes the Lostwood Wilderness, which covers nearly a quarter of its area, and it also oversees two other refuges and two wetland management districts. A notable part of its conservation history was the 1964 reintroduction of the giant Canada goose, Branta canadensis maxima, once thought extinct, whose population has since grown greatly. Numerous mammals live there as well, including moose, the largest.