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In addition to studying birds and mammals, the Survey's responsibilities included managing the nation's first wildlife refuges, controlling predators, enforcing wildlife laws, and conserving dwindling populations of migratory birds. The Bureaus of Fisheries and Biological Survey were transferred to the Department of the Interior in 1939. In 1940, they were combined and named the Fish and Wildlife Service. Further reorganization came in 1956 when the Fish and Wildlife Act created the United States Fish and Wildlife Service and established two bureaus, Sport Fish and Wildlife and Commercial Fisheries. In 1970, the Bureau of Commercial Fisheries.