A hungry wolf sits and waits for an injured elk to succumb to exhaustion. But time isn't on his side - if he waits too long, he'll lose his prey to other wolves.
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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