Bear courtship in Yellowstone National Park happens at breakneck speed - literally. The male grizzly sets off after the female, who tries to outrun him reaching speeds of up to 35 miles an hour.
For decades, Yellowstone National Park's ecosystem was out of balance. Its wolves had vanished, and its grizzly bears were pushed to the edge of extinction. Now, through conservation efforts and one of the most ambitious restoration projects in history, the carnivores have returned in record numbers. Host Bill Pullman gives you an up-close look into nature's dramas over the course of a year.
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