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the last wolves were killed in 1926.
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Gray wolves had been extirpated
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wolves were killed.
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National Park Service maintained its policies of predator control in the park until this year.
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park managers were working on reintroducing the wolves back into Yellowstone.
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Gray wolf was listed as number one endangered species.
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The first recovery plan was completed ,although gained little traction
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The final statement was publised for reestablishing the wolves in Yellowstone.
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Gray wolves were reintroduced in Yellowstone
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Wolves were being transported to Yellowstone.