The Yellowstone Grazer is an animal that feeds on the vegetation of Yellowstone National Park. The three animals that make up the Yellowstone Grazer are the MOOSE (5 letters), BISON (5 letters) and ELK (3 letters). MOOSE are the largest members of the deer family, with males weighing up to 1, 500 pounds. BISON are the largest land mammals in North America, with males weighing up to 2, 000 pounds. ELK are the second largest members of the deer family, with males weighing up to 700 pounds. All three of these animals are found in Yellowstone National Park and are important grazers in the park's ecosystem.