Oxen are herbivores, which means they eat plants and grains for food. Oxen that are kept as pets eat fresh grass as well as hay and grains. Wild oxen, like musk-oxen, live in the Arctic tundra and eat roots, moss, and lichens.
Oxen that are used for farming can start working as early as four years old. They are castrated because steers are easier to work with than bulls for people who drive teams. Wild musk-oxen use their hooves to dig through the snow to get to food. They have long, shaggy hair that helps them survive in cold weather. They live in groups of two to thirty to protect themselves from wolves.