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FILE - In this Feb. 17, 2020, file photo, a bison walks through the snow in Yellowstone National Park's Lamar Valley near Mammoth Hot Springs, Wyo. The superintendent of Yellowstone National Park says it likely won’t reopen until May 2020 or later, delaying the start of its traditional summer season for millions of tourists because of the coronavirus outbreak. Yellowstone and Grand Teton National Park have been closed since March 24, 2020, because of the virus. (AP Photo/Matthew Brown, File )

FILE - In this Feb. 17, 2020, file photo, a bison walks through the snow in Yellowstone National Park's Lamar Valley near Mammoth Hot Springs, Wyo. The superintendent of Yellowstone National Park says it likely won’t reopen until May 2020 or later, delaying the start of its traditional summer season for millions of tourists because of the coronavirus outbreak. Yellowstone and Grand Teton National Park have been closed since March 24, 2020, because of the virus. (AP Photo/Matthew Brown, File )

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