Video from the park shows a pair of grizzly bear cubs wrestling on the road as two other cubs played nearby.
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The man who took the video says he believes the cubs are offspring of one of the oldest known grizzlies living outside a zoo, Grizzly 399.
Social media famous Grizzly 399 is 24 years old and lives in the Grand Teton National Park and Bridger-Teton National Forest area.
According to The Guardian, Grizzly 399 was spotted with her four cubs for the first time in May.
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