united states fish and wildlife service
United States Fish and Wildlife Service. A unit in the U.S. Department of the Interior responsible for managing more than 93 million acres of land and water consisting of more than 500 national wildlife refuges and thousands of small wetlands. • It also administers or enforces laws relating to migratory birds, endangered species, certain marine mammals, and sports fisheries. — Abbr. FWS; USFWS.