I visited the US Fish and Wildlife Service's website. It says, "<span>Agency with mission of conserving, protecting and enhancing </span>fish<span>, </span>wildlife<span>, and plants and their habitats for the continuing benefit of the American people." "Protecting...wildlife" includes endangered species!
The United States Fish and Wildlife Service (1940) is a federal agency that aims to conserve, protect and enhance fish, wildlife and plants and their habitats. The agency intends to achieve its purpose by helping protect endangered species, watching and managing migratory birds, restoring nationally significant fisheries, conserving and restoring wildlife habitat, enforcing wildlife laws, among other activities.