The elk (scientific name: Elaphurus davidianus) is the only deer species in the family Deer and genus Deer. Because its head and face are long and narrow like a horse, its horns are slightly different from other deer, its hooves are wide like cows, and its tail is slender like a donkey, it is also known as the Four Elephant. Its horn shape is unique, opposite to the horns of other deer. The front branch splits into smaller branches, while the back branch hardly splits. The limbs are sturdy, the main hooves are broad and fleshy, with well-developed hanging hooves, and there is a loud knocking sound when walking. I prefer swamp and wetland habitats and feed on green grass and aquatic plants. Good at socializing, good at swimming, and enjoys eating tender grass and aquatic plants.