The Yellowstone Beast is a term used to refer to the four large mammals that inhabit the Yellowstone National Park in the United States. These animals include the ELK (3 letters), BISON (5 letters), MOOSE (5 letters) and BEAR (4 letters). ELK are the largest species of deer in North America, with males weighing up to 700 pounds. BISON are the largest land mammal in North America, with males weighing up to 2, 000 pounds. MOOSE are the largest species of deer in the world, with males weighing up to 1, 500 pounds. Bears are the largest carnivores in North America, with males weighing up to 800 pounds. All four of these animals are iconic symbols of the Yellowstone National Park and are collectively referred to as the Yellowstone Beast.