The Yellowstone is one of the most remarkable places on the planet. Its home to North America’s most iconic wildlife and every year these animals must survive The Thaw - one of the harshest seasonal changes on Earth. Temperatures swing from minus 40 Celsius in the winter to approaching 40 plus in the summer months. To understand how the animals cope and to witness the effects of our changing climate, this series follows the Thaw during 2016, a year when it's believed the unpredictable weather broke new records.