Photograph by David Guttenfelder As of this spring, chronic wasting has shown up in deer just miles away from Yellowstone, Grand Teton, and the National Elk Refuge. There are no simple solutions.

Wolves were reintroduced to Yellowstone in 1995 and as of January this year, the park reports there are 10 packs with at least 124 wolves in total. They largely prey on elk, deer and even bison.

Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park. Find more at natgeo ...

In Yellowstone, this involves wolves and other large carnivores, elk, and willows. The research, which utilized previously ...