Mystery in Yellowstone (2015)

Yellowstone National Park is home to a vast array of landscapes and a huge diversity of animals united in a fascinating ecosystem one that is currently in severe trouble The area once contained over 19000 elk but its numbers have plummeted by 80 in the last two decades The mysterious decline has sparked many questions and researchers are in a race to provide answers Join them as they investigate a series of theories and suspects from wolves to bears to trees to trout in an attempt to solve this alarming puzzle