is the most massive of the even-toed ungulates. is the tallest living land animal. is the largest extant
bovid. is the largest living deer. • The largest species in terms of weight is the
hippopotamus (
Hippopotamus amphibius), native to the rivers of sub-Saharan Africa. They can attain a size of , long and tall. Prehistoric hippos such as
H. gorgops and
H. antiquus rivaled or exceeded the modern species as the largest members of the family and order to ever exist. • The longest-bodied species, and tallest of all living land animals, is the
giraffe (
Giraffa sp.), measuring up to tall to the top of the head, and despite being relatively slender, reaching a top weight of . • The largest
extant representative of the
bovids, a diverse and well-known family, is the Asian forest-dwelling
gaur (
Bos gaurus), in which bulls can weigh up to , in total length and stand at the shoulder. The
wild yak (
B. mutus) reaches in height, and a weight of . The living
American bison (
B. bison) of North America is long, the tail adding . Shoulder heights in the species can range from . Weights can range from . The
European bison (
B. bonasus) may be less heavy than the American species, The heads and forequarters of American species are massive, and both sexes have short, curved horns that can grow up to long, which they use in fighting for status within the herd and for defense.
Wild water buffaloes (
Bubalus arnee) of Asia are larger and heavier than domestic buffaloes, and weigh from . Their head-to-body-length is with a tail long, and a shoulder height of . Both sexes carry horns that are heavy at the base and widely spreading up to The extinct
giant bison (
Bison latifrons) may be the largest bovid in the fossil record, with an estimated shoulder up to and a weight over .
Pelorovis also reached 2,000 kg in weight.
Domestic cattle (Bos
taurus) are usually smaller, although obese steers have been reported to weigh up to . The largest antelope is the
giant eland (
Taurotragus derbianus) from Africa. They are typically between in head-and-body length, stand approximately at the shoulder, and weigh . • The largest species in the pig family is generally the
giant forest hog (
Hylochoerus meinertzhageni), a native of the African rainforests, at up to , in length and high at the shoulder. Although
wild boars (
Sus scrofa) have reportedly reached historically, especially the Manchurian subspecies (
Sus scrofa ussuricus) and obese domestic pigs (
S. domesticus) which have been weighed at . The largest wild suid to ever exist was
Kubanochoerus gigas, having measured up to and stood more than tall at the shoulder. • The
largest living
cervid is the
moose (
Alces alces), particularly the Alaskan subspecies (
A. a. gigas), verified at up to , a total length of and a shoulder height of . The largest deer of all time was
C. latifrons estimated to have reached With the body mass of
C. latifrons was around . In some cases, this species could have weighed perhaps up to with the largest specimens perhaps reaching at the shoulder. It, the extinct
Irish elk (
Megaloceros giganteus) and the
stag-moose (
Cervalces scotti) were of similar size to the Alaskan moose. However, the Irish elk could have antlers spanning up to across, about twice the maximum span for a moose's antlers. • The largest members of the
camel family are either the
bactrian camel (
Camelus bactrianus), which is still wild in the steppe of central Asia, or the similarly sized
dromedary (
Camelus dromedarius), which no longer exists as a purely wild species but is widespread in the Middle East as a domestic animal, with a large
introduced feral population in Australia. Both camels can weigh up to , in total length, tall at the shoulder and a height of at the hump. Several giant camels are known from fossils, the previous record holders, including
Titanotylopus from North America, both possibly reached and a shoulder height of over . An extinct species of camel from Syria, also known as the "
Syrian camel", may have been even larger, at an estimated shoulder height of 3.6 or even 4 m (12–13 ft).
Whales (Cetacea) are the largest of all toothed whales. • The largest whale (and largest mammal, as well as the largest animal known ever to have existed) is the
blue whale, a
baleen whale (Mysticeti). The longest confirmed specimen was 33.58 m (110.17 ft) in length and the heaviest was 190 tonnes. Its closest competitors are also baleen whales, the
fin whale (
Balaenoptera physalus), which can reach a size of in length and weight of 109 tonnes, and the
bowhead (
Balaena mysticetus) and
North Pacific right whale (
Eubalaena japonica), both measured up to and estimated at that length to weigh about 133 tonnes. • The largest toothed whale (Odontoceti) is the
sperm whale (
Physeter macrocephalus), bulls of which usually range up to long and a mass of 50 tonnes. • The
orca or killer whale (
Orcinus orca) is the largest species of the oceanic
dolphin family. The largest orca ever recorded was a male off the coast of Japan, measuring long and weighed 10 tonnes. is the largest
oceanic dolphin. • The largest porpoise is the
Dall's porpoise (
Phocoenoides dalli), at up to and in length. • The largest
beaked whale is the
Baird's beaked whale (
Berardius bairdii) at up to 14 tonnes and long. • The largest of the
beluga and narwhal is the
beluga whale (
Delphinapterus leucas). Adult male beluga whales can range from , while the females measure . • The largest river dolphin is the
Amazon river dolphin (
Inia geoffrensis) from Amazon basin at a length of , depending on subspecies. Females are typically larger than males. The largest female Amazon river dolphins can range up to long. • Fragmentary fossils of extinct
rorquals from the
Pliocene epoch suggest they rivaled the size of the largest whales today. •
Perucetus, the largest
Archaeoceti, has an estimated length exceeding 17.0–20.1 meters and weight ranging from 85–340 t which also rivaled the size of the largest whales today. However, a 2024 study proposed a much smaller size of 17 m to 20 m and 98-114t. With a 2025 study further downsizing it to 15m to 16m and 35-40t. == Carnivorans (Carnivora) ==