The term 'Antlered Yellowstone Beast' is a reference to the ELK, which is a species of large deer native to North America and Eurasia. The ELK is also known as the wapiti, which is derived from the Shawnee and Cree word meaning 'white rump'. ELK are the second largest species of deer in the world, with males typically weighing between 300 and 700 pounds. They are characterized by their large antlers, which can reach up to 4 feet in length. ELK are found in many parts of the United States, including Yellowstone National Park, where they are a popular tourist attraction.