The term 'Rocky Mountain ELK' refers to a species of large deer native to the Rocky Mountains in North America. The scientific name for this species is Cervus canadensis, and it is commonly referred to as an ELK due to its size and antlers. ELK are the largest land mammal in North America and can weigh up to 700 pounds. They are also known for their impressive antlers, which can span up to five feet across. ELK are an important part of the Rocky Mountain ecosystem, providing food for predators such as wolves and bears.