The U.S. Fish and Wildlife Service approves the Northern Rocky Mountain Wolf Recovery Plan.
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The gray wolf is protected by Congress under the Endangered Species Act, and the Rocky Mountain wolf recovery team is established.
Aldo Leopold, pioneer of American conservation, recommends bringing wolves back to Yellowstone.
Wolf eradication campaign begins. The U.S. government approves destroying all species “injurious to agriculture” in the West. Yellowstone National Park begins a wolf eradication campaign.
