(Jacob W. Frank | National Park Service via AP) A wolf from the Wapiti Lake pack silhouetted by a nearby hot spring in Yellowstone National Park in 2018. Wolves have repopulated the mountains and forests of the American West with remarkable speed since their reintroduction 26 years ago, expanding to more than 300 packs in six states. Now Colorado plans to relocate some of these wolves in the hopes of reestablishing the grey wolf in the Centennial State.