The United States Fish & Wildlife Service based in Washington, D.C., is charged with conserving, protecting, and enhancing fish, wildlife, and their habitats for the benefit of the American people. As a division of the U.S. Department of the Interior, the Service's primary responsibilities are for the protection of migratory birds, endangered species, freshwater and anadromous (saltwater species that spawn in freshwater rivers and streams) fisheries, and certain marine mammals.

In addition to its Washington, D.C., headquarters, the Service maintains seven regional offices and a number of field units. Those include national wildlife refuges, national fish hatcheries, research laboratories, and a nationwide network of law enforcement agents.

The Service manages 530 refuges that provide habitats for migratory birds, endangered species, and other wildlife. It sets migratory bird hunting regulations, and leads an effort to protect and restore endangered and threatened animals...