Mule Deer are named for their large, 9 inches long, mule-like ears that keep deer alert for signs of danger. Their vision and hearing are acute, but Mule Deer rely largely upon the sense of smell. They can easily overlook stationary objects. They have an obvious white rump patch, and a small, rope-like white tail with a black tip. The Mule Deer's fine-textured coat is reddish-brown in the summer and grayish with dark brown coloration on the chest in the winter.