An experienced tracker makes an incredible discovery in a seemingly uninhabited meadow. Subscribe: bit.ly/BBCEarthSub Watch more: Planet Earth bit.ly/PlanetEarthPlaylist Blue Planet bit.ly/BluePlanetPlaylist Planet Earth II bit.ly/PlanetEarthIIPlaylist Planet Dinosaur bit.ly/PlanetDinoPlaylist Expedition Wolf Once shot to the brink of extinction, wild wolves are now returning to the United States with a vengeance. They are crossing the Canadian border and tension is mounting. A team of biologists track down these top predators to find out if there's something special about these wolves that's helping them to survive. It's a difficult mission in an unforgiving mountain landscape and the team must struggle through snow covered forests, along ancient paths and through long forgotten valleys. Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this. Want to share your views with the team? Join our BBC Studios Voice: www.bbcstudiosvoice.com/register This is a page from BBC Studios who help fund new BBC programmes. Service information and feedback: bbcworldwide.com/vod-feedback--contact-details.aspx

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