Animals in harness refers to the use of animals, such as OXEN, horses, and donkeys, to pull a vehicle or plow. OXEN are a type of bovine animal, usually a pair of bulls, cows, or steers, that are trained to work together in harness. They are often used in agriculture to pull plows and carts, and in some parts of the world they are still used for transportation. OXEN have been used in harness for centuries, and are still used in many parts of the world today.