Wildlife

Yellowstone National Park is a national park located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone, the first National Park in the U.S. and widely held to be the first national park in the world, is known for its wildlife and its many geothermal features, especially Old Faithful Geyser, one of the most popular features in the park. It has many types of ecosystems, but the subalpine forest is the most abundant. It is part of the Rockies ecoregion.

The ecosystem is the largest remaining continuous stretch of mostly undeveloped pristine land in the continental United States, considered the world’s largest intact ecosystem in the northern temperate zone. With the successful wolf reintroduction program, which began in the 1990s, virtually all the original faunal species known to inhabit the region when white explorers first entered the area can still be found there. As a result, small animals, ground mice and rabbits also returned to the now growing meadows. The birds of prey such as the eagle returned to find a replenished source of food.