What Baby Animals Are Called Calves?

The word “calf” applies to the young of a surprisingly wide range of mammals, not just cattle. Elephants, whales, dolphins, rhinoceroses, hippopotamuses, manatees, walruses, giraffes, moose, elk, and several species of antelope all produce young known as calves. The common thread linking most of these animals is large body size and offspring that are born relatively well-developed, but the full list includes some members that stretch the pattern in interesting ways.

Cattle, Bison, and Other Bovids

Cattle are the animals most people picture when they hear the word “calf.” A domestic dairy calf typically weighs somewhere around 35 to 40 kilograms at birth, though the number varies with breed, whether the birth is a singleton or twin, and the cow’s parity. Holstein calves tend to be heavier than Jersey calves, and male calves outweigh females by a couple of kilograms on average.¹ Gestation runs about 280 days, and calves born after shorter gestations tend to weigh less, with each additional week in the womb adding a meaningful amount of body mass.²

The terminology extends to all domestic cattle breeds, including beef cattle like Angus and Hereford, as well as water buffalo and yak. Wild bovids share the term too. American bison calves are born mostly in a tight seasonal window, with roughly 80% arriving in late April and the first two weeks of May. During calving season, cow-calf pairs tend to group with other mothers and their calves rather than with cows that have not yet given birth.³ Cape buffalo, gaur, and banteng calves also go by the same name. Across all bovids, the young are up and moving within hours, an early sign of the precocial development pattern that connects many calf-bearing species.

Elephants

Elephant calves are among the most charismatic newborns in the animal kingdom, and also among the largest. An African elephant calf weighs roughly 100 to 120 kilograms at birth after a gestation of about 22 months, the longest of any land mammal. Asian elephant calves are slightly smaller but still enormous by most standards. In captivity, African elephant calves show a clear developmental progression in the first three months of life, including increasingly skilled use of the trunk and growing social interactions with other elephants in the herd.⁴

Asian elephant calves roughly quadruple their body mass during the first year, gaining at a rate of about 0.9 kilograms per day. Their mother’s milk changes as they grow: energy content roughly doubles between birth and two years of age, with fat and protein concentrations rising while sugar content drops.⁵ Elephant calves nurse for several years and remain close to their mothers for much longer, learning migration routes, social dynamics, and foraging strategies from the herd’s older females. This prolonged maternal investment is one reason elephants are so vulnerable to poaching and habitat loss: losing a matriarch can leave calves without the knowledge they need to survive.

Rhinoceroses and Hippopotamuses

All five living rhinoceros species produce calves. Rhino calves are born one at a time after gestations ranging from about 15 to 16 months, and they stay close to their mothers for years. Sumatran rhinoceros calves, among the smallest of the rhino species at birth, weigh around 33 kilograms and then grow rapidly, reaching roughly 400 kilograms by their first birthday. Nursing bouts are frequent, occurring about every 90 minutes in the first half of the year and tapering to about every two hours later on.⁶ Eastern black rhinoceros calves follow a similar pattern: nursing duration increases gradually over the first six months, and the calves spend the vast majority of their time right next to the mother.⁷

Hippopotamus young are also called calves. Common hippo calves are born underwater or in shallow water and must swim to the surface for their first breath. They weigh about 25 to 50 kilograms at birth. Pygmy hippopotamus calves are considerably smaller, often born on land, and gain international fame with startling ease when zoos share photos of them. Both species nurse underwater, with the calf folding its ears and closing its nostrils to latch on. The term “calf” fits the hippo pattern: a single, large, precocial offspring that stays with its mother for an extended period.

Whales and Dolphins

Every cetacean species, from the blue whale down to the smallest porpoise, produces young called calves. These are some of the most extreme calves in the animal kingdom. A blue whale calf is born at roughly seven meters long and around 2,500 kilograms, making it one of the largest newborns of any animal that has ever lived. Baleen whale mothers have relatively brief lactation periods of five to seven months, but the energy they pour into milk is staggering. Their milk contains 30 to 50 percent fat, with water content dropping to as low as 40 percent, essentially a dense nutritional slurry. A blue whale mother’s daily energy output in milk has been estimated to reach around 4,000 megajoules per day, fueled by blubber stores she built up on feeding grounds before giving birth.⁸

Dolphin calves face a different challenge. Born into open water, they need to keep pace with a moving pod from their very first minutes of life. They manage this partly by “drafting” alongside their mothers, swimming in a position where the mother’s body creates a hydrodynamic slipstream. A newborn dolphin calf can gain up to 90 percent of the thrust it needs to keep pace at speeds up to 2.4 meters per second by riding in this drafting position. In eastern spinner dolphins, the energy savings for calves swimming alongside their mothers can reach about 60 percent.⁹ Toothed whales and dolphins nurse for much longer than baleen whales, sometimes several years, and their calves learn foraging techniques and social behavior from the pod during this extended dependency.

Manatees, Dugongs, and Walruses

Sirenians, the group that includes manatees and dugongs, also have calves. Manatee calves are born underwater and must reach the surface to breathe within minutes. They vocalize almost immediately, and researchers have found that the acoustic qualities of those calls differ across species and vary with body size. Amazonian manatee calves produce shorter, higher-pitched calls with multiple notes, while West Indian manatee calves make longer, lower-frequency modulated calls. Smaller calves tend to produce frequency-modulated, hill-shaped calls that flatten as the animal grows.¹⁰ These calls help maintain the mother-calf bond in murky waterways where visibility is poor.

Walruses round out the marine mammals whose young are called calves rather than the “pups” used for most seals and sea lions. Walrus calves are born on ice or land after about 15 months of gestation and nurse for over two years. Their lactation strategy resembles that of sirenians and dolphins more than it does other pinnipeds: the calf stays in constant proximity to the mother and nurses on demand, rather than being left on shore while the mother forages at sea.¹¹ This extended dependency period allows the young walrus to develop its diving and foraging abilities gradually, a luxury afforded by the walrus’s shallow-water benthic feeding habits. Among pinnipeds as a group, the species with longer lactation periods tend to have slower calf growth rates, but the trade-off gives offspring time to learn the swimming and foraging skills they need before independence.¹²

Deer, Moose, Elk, Giraffes, and Other Surprises

Not all deer young are called calves. Whitetail deer and mule deer young are “fawns.” But the larger cervids break the pattern. Moose young are calves. Elk young are calves. Caribou and reindeer young are calves. The dividing line is not perfectly consistent, but in practice, the larger members of the deer family acquired the term while the smaller species kept “fawn.” Red deer, wapiti, and sambar deer young may be called calves depending on regional convention, though “fawn” is sometimes used interchangeably for some of these species.

Giraffes are another animal whose young are called calves despite having no close relationship to cattle. A giraffe calf enters the world from a height of about 1.5 meters, dropping to the ground as the mother gives birth standing up. They are roughly 1.8 meters tall at birth and can stand within an hour. Camels, both dromedary and Bactrian, also produce calves. So do some antelope species, particularly the larger ones like eland and kudu, though many smaller antelope young are simply called “young” or, occasionally, “fawns” or “kids” depending on the species and the tradition of the region.

Why So Many Different Animals Share the Term

The word “calf” traces back to Old English “cealf,” which originally referred specifically to young cattle. As English speakers encountered or learned about larger animals around the world, they extended familiar livestock terminology to unfamiliar species. Whaling communities applied “calf,” “cow,” and “bull” to whales centuries ago, and the terms stuck in scientific and popular usage alike. The same pattern played out with elephants, rhinos, and hippos as European explorers described them using the animal vocabulary they already had.

There is no formal zoological rule that defines which animals get to have “calves.” It is a convention, not a classification. But the convention is not random, either. Almost every animal whose young are called calves shares a few characteristics: the adults are large-bodied, they give birth to one offspring at a time (occasionally two), and that offspring is born in a relatively advanced state. It can stand, swim, or move shortly after birth. Biologists call this precocial development, and it shows up across nearly all calf-bearing species.

A study of an ancient whale ancestor, Maiacetus, found that its fetal skeleton already had well-developed teeth before birth, comparable to a newborn fallow deer. The researchers argued that precociality was a defining feature of the lineage leading to modern marine mammals: semiaquatic young needed to move soon after birth to avoid predators on land and in the water, and larger newborn body size helped them maintain body temperature in exposed or aquatic environments.¹³ That description applies almost perfectly to modern whale calves, elephant calves, hippo calves, and most of the other species on the list. The “calf” label maps loosely onto a real biological strategy: invest heavily in a single, large, well-developed offspring that can keep up with its mother from day one.

Animals Whose Young Are Not Calves

The boundaries of “calf” usage are worth knowing because some near-misses surprise people. Seals and sea lions, despite being marine mammals, have “pups.” Horses have “foals,” not calves, even though they are large-bodied and precocial. Pigs have “piglets.” Sheep have “lambs.” Goats have “kids.” These are all conventions rooted in centuries of pastoral language, and they do not follow a single logical system.

Among marine mammals, the split is loosely consistent: cetaceans (whales and dolphins) and sirenians (manatees and dugongs) have calves, while pinnipeds mostly have pups, with walruses as the notable exception. Polar bears, despite being semiaquatic and enormous, have “cubs.” The logic has more to do with cultural and linguistic history than biology. English-speaking communities that interacted with a given animal first tended to set the naming convention, and once it was established, it rarely changed.

Some animals sit in a gray zone. Yak young are usually called calves, which makes sense given that yaks are bovids. Llama and alpaca young are called “crias,” borrowing from Spanish. Water buffalo calves are unambiguously calves. But ask what a baby tapir is called, and you will get a variety of answers: “calf” appears in some references, but “cub” and simply “baby” also show up. The lack of a standardized system means that for some less-common species, the answer depends on who you ask.

How Calf-Rearing Strategies Differ Across Species

Despite sharing a name, the lived experience of being a calf varies enormously across these animals. A dairy calf in a modern farming operation may be separated from its mother within hours or days and raised on milk replacer. A bison calf stays with its mother and the larger herd, relying on the group’s vigilance for protection during its vulnerable first weeks.³ An elephant calf benefits from an entire family group, with aunts and older siblings helping to guide and protect it for years.

The duration of dependency is one of the starkest differences. Baleen whale calves are weaned in five to seven months, a compressed timeline fueled by extraordinarily energy-dense milk that allows rapid growth.⁸ Walrus calves may nurse for more than two years.¹¹ Elephant calves nurse for three to five years in some populations. At the short end, a domestic beef calf is typically weaned at six to eight months. Moose calves stay with their mother through their first winter and are driven off the following spring when the next calf is born.

Growth rates also vary wildly. A Sumatran rhino calf grows from 33 kilograms to 400 kilograms in its first year, roughly a twelvefold increase.⁶ An Asian elephant calf quadruples its birth mass in the same period.⁵ A blue whale calf may gain 90 kilograms per day during the nursing period. A dairy calf, by comparison, gains somewhere around 0.7 to 1.0 kilograms per day in its first months. The scale differences are enormous, but the underlying strategy is recognizable across all of them: a large, mobile newborn that depends on its mother’s milk and protection while it develops the skills and size needed for independence.

When the Same Species Goes by Different Names in Different Regions

Regional variation in animal baby names is real and occasionally confusing. In parts of Australia, a young buffalo might be called a “poddy calf” if it has been orphaned and hand-raised. In the United Kingdom, a young red deer is traditionally called a “calf,” while in North America, hunters and wildlife biologists may use “calf” for elk but “fawn” for the closely related red deer. Reindeer herders in Scandinavia and northern Russia have their own terminology for calves at different stages of development, reflecting the centrality of reindeer calving to pastoral life. The Sámi languages, for instance, have distinct words for a newborn calf, a calf in its first autumn, and a yearling, distinctions that reflect practical needs in managing herds across seasons.

Even within English, the plural can trip people up. The plural of “calf” is “calves,” following the same pattern as “half/halves” and “leaf/leaves.” And the anatomical term for the back of the lower leg, also “calf,” shares the same plural but has an entirely separate etymology, deriving from Old Norse “kalfi” rather than the Old English word for a young bovine. The overlap is a coincidence of language, not biology.