Wolves were eradicated and cougars driven to low numbers from Yellowstone National Park by the 1920s. Browsing by elk soon ...

Hallac ticked through a list of interrelated concerns, nagging issues in Yellowstone familiar to us both: bison management, elk migration ... from decades of heavy browsing.

In 1995 and 1996, some 70 years after Yellowstone’s last wolf howled its last howl, 31 wolves from western Canada were released from acclimation pens across the park. They took hold of the ...