Oxen (Bos taurus)

An ox is a domesticated and castrated male cattle. Oxen are docile, but they are a top contender for the strongest animal in the world. Humans have used this immensely powerful animal as a draft animal for over 6,000 years.

They run at a top speed of 26 km per hour, and an ox can weigh up to 3,000 pounds. Oxen can pull heavy loads like carts, plows, and wagons. They also used them to turn-milling stones. Those are no small feats, considering that oxen can work for 5 hours or more each day on any of those tasks.