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It was one of nature's greatest - and most controversial - experiments: bringing wolves back to Yellowstone. What happened next no one could predict. The Druid Peak pack would become the biggest and most-watched wolf pack in history. (National Geographic)
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Photo © National Geographic Channel
![Yellowstone Wolf Dynasty - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/162/893/162893819_7ae949.jpg)