One of the lions that is part of a wildlife research project headed by Yellowstone biologist Dan Stahler. Yellowstone's scientific studies of lions, wolves and grizzly bears are world-rewnoned. Photo by Jacob W. Frank/NPS
One of the lions that is part of a wildlife research project headed by Yellowstone biologist Dan Stahler. Yellowstone's scientific studies of lions, wolves and grizzly bears are world-rewnoned. Photo by Jacob W. Frank/NPS