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In this undated photo provided by Grand Teton National Park a grizzly bear known as No. 399 walks along side a cub. (C. Adams/Grand Teton National Park via AP)

In this undated photo provided by Grand Teton National Park a grizzly bear known as No. 399 walks along side a cub. (C. Adams/Grand Teton National Park via AP)

In this undated photo provided by Grand Teton National Park a grizzly bear known as No. 399 stands along side a cub. (C. Adams/Grand Teton National Park via AP)

In this undated photo provided by Grand Teton National Park a grizzly bear known as No. 399 stands along side a cub. (C. Adams/Grand Teton National Park via AP)

In this undated photo provided by Grand Teton National Park a grizzly bear known as No. 399 walks along side a cub. (C. Adams/Grand Teton National Park via AP)

In this undated photo provided by Grand Teton National Park a grizzly bear known as No. 399 walks along side a cub. (C. Adams/Grand Teton National Park via AP)