What are the main organisms in the Yellowstone National Park ecosystem?

The Yellowstone National Park ecosystem is characterized by a diverse range of organisms, including large mammals such as bison, elk, and grizzly bears. It also hosts a variety of smaller mammals, birds, reptiles, and amphibians, as well as an extensive array of plant species. Aquatic life thrives in its rivers and lakes, with fish like cutthroat trout being prominent. Additionally, geothermal features support unique microbial communities that are adapted to extreme conditions.