Yay for the Mighty Ox!
If you see photos of oxen and find yourself wondering "wait... isn't that a bull?" allow me to explain.
Oxen (singular ox) are bovines trained as draught animals. They are adult, castrated males. (So steers, not bulls) Oxen are used for ploughing, transport, hauling cargo, threshing grain by trampling, powering machines for grinding grain, irrigation or other purposes, and drawing carts and wagons.
They can pull more weight than horses and aren't injured as easily.
But you can still ride one if you are so inclined.