Yellowstone is home to hundreds of species of birds, fish and mammals, according to the NPS. It is the only national park in North America where there are no fences to contain the wildlife, and therefore, they are able to roam freely, Hamilton said.

There’s a new milky blue pool in Yellowstone National Park. Yellowstone geologists discovered the baby hydrothermal feature in April while doing routine work at Norris Geyser Basin, the park’s oldest geothermal area,