Great Yellowstone ThawOfficial Trailer Preview | 30s Journey with Kirk Johnson to Yellowstone, where wolves, grizzlies, beavers and Great Gray owls survive one of the greatest seasonal changes on the planet. As the temperature swings 140 degrees, cameras capture how the animals cope. Aired: 06/21/17 Rating: TV-G Closed CaptioningVideo has closed captioning.checkmarkAdd to WatchlistProblems Playing Video?Report a ProblemClosed CaptioningShare:Share this video on FacebookFacebookShare this video on TwitterTwitterShare this video on Google PlusGoogleShare this video via EmailE-mailReport a ProblemBefore you submit an error, please consult our Troubleshooting Guide.Type of ErrorVideo doesn't loadVideo loads, but doesn't playVideo jumps back/forwardOnly audio is streamingSponsorship playback errorOtherPlease add more detailsCancelSubmit ReportYour report has been successfully submitted. Thank you for helping us improve PBS Video.CloseCloseClose Learn More Down Learn More About the Show Get ready to explore a place where animals cope with 140 degree temperature swings. Meet Kirk Johnson Dr. Kirk Johnson is the Sant Director of the Smithsonian Museum of Natural History. Learn About Episode 1 Follow the dramatic ups and downs as the wildlife families brave a brutal winter. Learn About Episode 2 Spring is here and Yellowstone is bursting into life, but the thaw is just beginning.