- United States Fish and Wildlife Service, US Fish and Wildlife Service, FWS - an agency in the Department of the Interior that conserves and protects fish and wildlife andtheir habitats; assesses the environmental impact of pesticides and nuclear power site and hydroelectric dams and thermal pollution
--1 is a kind of agency, federal agency, government agency, bureau, office, authority
--1 is a part ofDepartment of the Interior, Interior Department, Interior, DoI