Attempts were made in the 1930s and thereafter to eliminate these animals as pests, in the United States, particularly in [[Yellowstone National Park]]. The Canadian government also made plans to exterminate wolves (see [[Farley Mowat]]). Thankfully, this effort was unsuccesful as wolves still survive in both countries. | Attempts were made in the 1930s and thereafter to eliminate these animals as pests, in the United States, particularly in [[Yellowstone National Park]]. The Canadian government also made plans to exterminate wolves (see [[Farley Mowat]]). Thankfully, this effort was unsuccesful as wolves still survive in both countries. |