The wolf population in Yellowstone National Park was essentially wiped out by the mid 1920's. That changed in 1995, when the National Park Service reintroduced them there. So, 20 years later, how has the park's ecosystem responded to the return of the wolves? Watch how #NSFfunded Utah State University wildlife ecologist Dan MacNulty and his team work in partnership with the National Park Service to find out! Fuller understanding of what's happening in Yellowstone could translate to better predat