They are prominent modern members of the subfamily Bovinae and the most widespread species of the genus Bos. Mature female cattle are called cows and mature male cattle are bulls. Young female cattle are called heifers, young male cattle are bullocks, and castrated male cattle are known as oxen or steers.
Steers on the other hand, have been castrated at a young age, before they develop a bull's characteristics. Steers won't be as muscular or as aggressive as their bull counterparts. Besides their general build, spotting the difference is easy, if they have cojones, they're a bull.
A male cow is usually called a bull. However, this only applied to adult males that have not been neutered. Young male cows are called calves or bull calves. If a farmer has a bull castrated, a specific type of neutering that removes the testicles of the animal, the male cow is often called a steer.
ox, (Bos taurus, or B. taurus primigenius), a domesticated form of the large horned mammals that once moved in herds across North America and Europe (whence they have disappeared) and Asia and Africa, where some still exist in the wild state. South America and Australia have no wild oxen.
A cow is a female that has given birth to at least one calf. Before giving birth for the first time, a female is called a heifer. Bulls are intact male catle of any age, while steer are castrated male cattle.
Put simply, an ox (or oxen if you're talking about more than one), is any cattle over four years of age that has been trained to do work. Most often they are steers (castrated male cattle). Any breed of cattle can be trained to become an ox, although some breeds are better suited to it than others.
Beef can be made from either male or female cattle. For breeds explicitly raised for beef, like Angus or Herefords, all calves are reared for meat regardless of sex. Increasingly, cows and bulls of the Holstein breed born on dairy farms are inserted into the beef production system.
Oxen are commonly castrated adult male cattle, because castration inhibits testosterone and aggression, which makes the males docile and safer to work with. Cows (intact females) or bulls (intact males) may also be used in some areas.
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The tubeworm Escarpia laminata that lives in deep sea cold seeps regularly reaches the age of between 100 and 200 years, with some individuals determined to be more than 300 years old. Some may live for over 1,000 years.
A male bovine — or cow — is a bull, and so is a male whale or elephant. Fittingly, the word bull is sometimes also used for a particularly bulky, muscular man.
A female bovine, 2 ½ years old or younger that exhibits cow characteristics, that has not had her first calf or recently lost her first calf.
The Minotaur, of course, is a cow-human hybrid, which nearly everyone dismisses as a myth. But there are also many reports alleging that actual hybrids of this sort have been birthed, both by cows and by women.
Female cattle in oestrus may mount any adult cattle, especially a bull (fertile male) if one is present, but they will also mount castrated males or other females. A bulling female will often also be mounted by other cattle, both male and female, though only fertile males are usually capable of mating.
Cattle Population by Country 2026
An immature female is called a heifer, and an immature male is called a bull. A mature female who has had a calf is called a cow, and a mature breeding male is called a bull. A castrated male is called a steer. Most beef cattle raised for the harvest of their meat are steers or heifers.
The planet's biodiversity is plunging, with a quarter of species facing extinction, many within decades. Numerous experts believe we are living through, or on the cusp of, a mass species extinction event, the sixth in the history of the planet and the first to be caused by a single organism—us.
From 'psychedelic' spiders to European eels: 10 species heading into 2026 on the brink of extinction
Nobody can predict exactly when humans will go extinct. However, humans will go extinct at some point, because extinction is what happens to all species, and there are signs that humans will go extinct soon, in geological terms.
Bison and domestic cattle diverged from a common ancestor somewhere around three million years ago. But like many related mammals, they can still interbreed and produce fertile hybrids. (Read more about hybrids and how they happen.)
An ox isn't a good choice as an milking animal, as it typically is a castrated male bovine. If female, it would at least produce milk, but then it would just be a cow used for plowing, and would have the same milk as a dairy cow: https://en.wikipedia.org/wiki/Ox.
Ox vs Bull: Size and Strength
Another key difference between oxen and bull lies in their respective sizes and strengths. For example, oxen are usually both larger and stronger than bulls are, given that they have been bred for work and transportation purposes.
All mammals are edible. (Not the liver of polar bears, the Platypus venom glands.) Avoid animals that live from waste and carcasses like possum, rats,.. they may carry diseases. All birds are edible (not therefore tasty).
Not all twins share placental vascular connections, so not all females that are born co-twin to males will be freemartins. Additionally, a freemartin may be externally indistinguishable from a fertile female.