The Yellowstone Animal crossword solutions are BEAR (4 letters), ELK (3 letters), BISON (5 letters), and WAPITI (6 letters). Bears, ELK, BISON, and WAPITI are all animals that can be found in Yellowstone National Park. Bears are large mammals that are typically brown or black in color. ELK are a species of deer that are known for their large antlers. BISON are large, shaggy-haired animals that are commonly referred to as buffalo. WAPITI are a species of deer that are similar to ELK but slightly smaller in size. All four of these animals can be found in the wilds of Yellowstone National Park.