Mule , hybrid offspring of the jack (male ) and the mare, much used and valued in many parts of the world as a beast of burden. The head, ears, croup, and tail resemble those of the , but in bulk and stature the mule resembles the horse, and seems to excel both its parents in sagacity, muscular endurance, surefootedness, and length of life. The hinny is the hybrid offspring of the jenny (female ) and the stallion (male horse). It has a bushier tail and a heavier body than the mule and is by nature a more tractable animal .