Yellowstone

The park, which forms a squarelike rectangle with an irregular eastern side, is 63 miles (101 km) from north to south and 54 miles (87 km) from east to west at its widest point and covers an area of 3,472 square miles (8,992 square km).

A temperate forest and grassland ecosystem in the northern Rocky Mountains of the United States, centered on Yellowstone National Park, the world's first national park, and sitting atop one of the largest volcanic systems on Earth, whose underlying heat powers the ecosystem's geysers and hot springs.

Other large mammals include the bison (often referred to as buffalo), elk, moose, mule deer, white-tailed deer, mountain goat, pronghorn, and bighorn sheep.

Other birds, considered species of special concern because of their rarity in Yellowstone, include the common loon, harlequin duck, osprey, peregrine falcon and the trumpeter swan.

Four species of amphibians are present: the boreal chorus frog, tiger salamander, western toad and Columbia spotted frog.

Four species of amphibians are present: the boreal chorus frog, tiger salamander, western toad and Columbia spotted frog.

Other conifers, such as subalpine fir, Engelmann spruce, Rocky Mountain Douglas-fir and whitebark pine, are found in scattered groves throughout the park.

Other conifers, such as subalpine fir, Engelmann spruce, Rocky Mountain Douglas-fir and whitebark pine, are found in scattered groves throughout the park.

Of the eight conifer tree species documented, lodgepole pine forests cover 80% of the total forested areas.

Hopewell grave goods include not only obsidian, but also copper shaped to resemble the horns of bighorn sheep native to the Rockies, which suggests the Hopewell may have visited Yellowstone themselves.