Yellowstone National Park was founded in 1872. It covers nearly 3,500 square miles of wilderness and contains many unusual geological features. The park is home to large populations of mammals, including bison and elk. For years, the elk population grew rapidly until the reintroduction of wolves to the park in 1995.1. Yellowstone National Park was founded in 1872. 2. It covers nearly 3,500 square miles of wilderness and contains many unusual geological features.

3. The park is home to large populations of mammals, including bison and elk.

4. For years, the elk population grew rapidly until the reintroduction of wolves to the park in 1995.