The National Wildlife Refuge System is managed by the U.S. Fish and Wildlife Service, an agency within the U.S. Department of the Interior. The FWS is the primary federal agency responsible for conserving and enhancing the nation’s fish and wildlife populations and their habitats. Although the FWS shares this responsibility with other federal, state, tribal, local and private entities, the FWS has specific trust resource responsibilities for migratory birds, threatened and endangered species, certain anadromous fish, certain marine mammals, coral reef ecosystems, wetlands and other special aquatic habitats. The FWS also has similar trust responsibilities for the lands and waters it administers to support the conservation and enhancement of all fish and wildlife and their associated habitats.