Stubborn beasts is a term used to describe animals that are difficult to control or manage due to their strong will and independence. Two examples of stubborn beasts are MULES and ASSES. MULES are the offspring of a male donkey and a female horse, and are known for their strength and endurance. ASSES, on the other hand, are members of the horse family and are known for their intelligence and agility. Both MULES and ASSES are often used as working animals due to their strength and intelligence.