A mule is a cross between a jack (male) donkey and horse mare. The original workhorse, mules have been shouldering our burdens as work, harness, riding, driving and pack animals since Roman times. Mules can be as small as ponies or as large as draft horses, and can have a variety of body shapes and colors. Highly intelligent and sensitive, mules have a strong sense of self-preservation. Limited to 2015 production.