elephant seal or sea elephant, a true seal of the genus Mirounga. It is the largest of the fin-footed mammals, or pinnipeds, exceeding the walrus in size. There is a northern species, Mirounga angustirostris, along the Pacific coast, and a larger southern species, M. leonina, that breeds on sub-Antarctic islands. Males commonly reach a length of 18 ft (5.5 m) and a weight of 5,000 lb (2,270 kg); the female may measure 10 ft (3 m). A hollow, flabby snout about 15-18 in. (38-45 cm) long on the male gives these seals their name. During the 3-month breeding season the largest bulls stake out territories and try to attract and hold as many females as possible. When a bull is sexually excited or angry it snorts air from the proboscis into the throat, producing sounds heard miles away. Bulls do not eat during breeding, but females without pups feed on squid, fish, crabs, and other organisms that compose their main diet. These earless seals are graceful in water, diving to 2,275 ft (700 m) for food. Seal hunters, who extracted oil from blubber, pushed the northern species to the edge of extinction in the 19th cent. In 1911 the Mexican government extended protection to the single remaining M. angustirostris colony on Guadalupe Island off Baja California; the United States eventually followed suit. By the early 1990s an estimated 60,000 animals were found on island rookeries off Baja and central California. Elephant seals are classified in the phylum Chordata, subphylum Vertebrata, class Mammalia, order Carnivora, suborder Pinnipedia, family Phocidae.

elephant bird, extinct, flightless bird of the family Aepyornithidae. Once native to the island of Madagascar, these gigantic birds may have survived until as late as 1649. Today, they are known only from bone specimens and a few well-preserved eggs. In appearance they are thought to have resembled monstrous ostriches, with the largest reaching heights of up to 10 ft (305 cm) and weighing perhaps as much as 1,000 lb (455 kg). Their eggs, the largest single cells in the animal kingdom, measured up to 13 in. (33 cm) in length and held a liquid content estimated at two gallons (7.5 liters). It is quite possible that the creation of the legendary roc of the Arabian Nights was based on discoveries of such eggs or even on distant memories of the elephant bird, for, if the roc legend did not originate in Madagascar, it has long been localized there by tradition. The largest of the elephant birds, Aepyornis maximus, was also the heaviest of all known birds. Elephant birds probably became extinct at the same time as the moas. Elephant birds are classified in the phylum Chordata, subphylum Vertebrata, class Aves, order Aepyornithiformes, family Aepyornithidae.

elephant, largest living land mammal, found in tropical regions of Africa and Asia. Elephants have massive bodies and heads, thick, pillarlike legs, and broad, short padded feet, with toes bearing heavy, hooflike nails. The gray skin is loose, tough, thick, and nearly hairless. The slender tail ends in a tuft of hair. The upper lip and nose are elongated into a flexible trunk, or proboscis, reaching nearly to the ground; this sensitive appendage is used for picking up food, feeding from trees and other sources, and drawing up water. Elephants drink by sucking water into the trunk and squirting it into the mouth; they also use the trunk to spray themselves with water and with dust. The trunk produces a variety of noises, including a loud trumpeting. African elephants also have been shown to use infrasonic frequencies (those below the range of human hearing) for communication. The large, thin, floppy ears provide an extensive cooling surface; the animal flaps its ears vigorously when it is overheated. The upper incisor teeth are elongated into tusks—highly valued for their ivory—which the animal uses for digging up roots and tubers. A gland between the eye and the ear periodically produces an oily substance called musth; during these periods the animal is in an excitable, dangerous condition, also called musth, meaning madness. Such a condition occurs more often in males than in females and is thought to be a state of sexual excitement.

Elephants are browsing animals, feeding on fruits, leaves, shoots, and tall grasses; they consume hundreds of pounds of food a day and drink up to 50 gal (190 liters) of water. They have no fixed living place, but travel about in herds of up to 100 animals, led by a young, strong male and including young bulls (males), cows (females), and calves. Old males are generally solitary or live in small groups. A rogue elephant is a solitary old male that has become violent and dangerous. During the mating season, elephant pairs may live away from the herd for a few weeks. A single calf is born after a gestation of 18 to 22 months and is nursed for 5 years. Elephants reach maturity at between 15 and 25 years of age; their lifespan is usually 60 or 70 years. Elephants walk at a pace of about 4 mi (6.4 km) per hr, but can charge at speeds of 30 mi (48 km) per hr. They cannot jump and so cannot pass barriers too wide or too high to step over; they swim well, however.

Indian and African Elephants

There are two species: the Indian elephant, Elephas maximus, found in India and SE Asia, and the African elephant, Loxodonta africana, found in Africa S of the Sahara. African bull elephants may reach a shoulder height of 13 ft (4 m) and weigh 6 to 8 tons (5,400-7,200 kg). Their tusks are more than 10 ft (3 m) long and weigh up to 200 lbs (90 kg) each. Females are somewhat smaller and have more slender tusks. African elephants have enormous ears, measuring up to 42 in. (107 cm) in diameter. The long, conspicuously wrinkled trunk terminates in two fleshy, fingerlike protuberances, used for handling objects. The Indian bull elephant reaches about 9 ft (2.7 m) in shoulder height and weighs about 3.5 tons (3200 kg); its tusks are up to 6 ft (180 cm) long. The female of this species has no tusks. The ears of the Indian elephant are much smaller than in the African species, and the trunk somewhat shorter and smoother, ending in a single protuberance.

Elephants and Humans

Elephants are regarded as among the most intelligent of mammals and can be trained to work and to perform. Indian elephants are extensively used as beasts of burden, especially in teak forests, where they carry logs with their trunks. They are not considered truly domesticated as they do not breed well in captivity; young animals are captured from the wild. Training and handling take skill, as elephants have complex emotions and vary individually in temperament. African elephants are often said to be less tractable, but they too were formerly used for work, as well as for warfare. Hannibal's army crossed the Alps using African elephants, which were at that time probably found in the Atlas Mts. Elephants seen in zoos and circuses are usually of the Indian species, although the famous Jumbo, who toured the United States in the late 19th cent. giving rides to children, was an African elephant. In Thailand and Myanmar (Burma), so-called white elephants have long been revered; these animals are not truly white but have unusual light-colored skin and other characteristics. Elephants have been extensively hunted for food and for ivory, and their numbers are now greatly reduced, but they are now afforded protection in certain areas.

Classification

Elephants are the only living representatives of their order, which was once widespread over most of the world; it included the mammoth and the mastodon. Elephants are classified in the phylum Chordata, subphylum Vertebrata, class Mammalia, order Proboscidae, family Elephantidae.

Elephant Butte Dam, main unit of the Rio Grande project of the U.S. Bureau of Reclamation on the Rio Grande, SW N.Mex.; completed 1916. The dam, with its large reservoir, is used for flood control, hydroelectric power, and irrigation. The project was involved in a water-rights dispute between the United States and Mexico that was settled by a treaty in 1906.

Either of the two largest pinniped species: the northern elephant seal (Mirounga angustirostris), of coastal islands off California and Baja California, or the southern elephant seal (M. leonina), of sub-Antarctic regions. Both are gregarious earless seals. The male has an inflatable, trunklike snout. The northern species is yellowish or gray-brown, the southern species blue-gray. Males of both species reach a length of about 21 ft (6.5 m) and a weight of about 7,780 lbs (3,530 kg) and are much larger than the females. Elephant seals feed on fish and squid or other cephalopods. During the breeding season, bulls fight to establish territories along beaches and to acquire harems of up to 40 cows.

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or elephant bird

Any of a group of giant flightless birds in the extinct genus Aepyornis, found as fossils in Pleistocene and post-Pleistocene deposits on Madagascar. Most were massively constructed (some stood more than 10 ft, or 3 m, high) and had a small skull and a long slim neck. Remains of aepyornis and its eggs (as large as 3 ft, or 1 m, in circumference) are common. Its ancestry is uncertain.

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Any of three ungulate species in the order Proboscidea (family Elephantidae), characterized by their large size, long trunk, tusks, massive legs, large ears, and huge head. All species are grayish to brown, with sparse, coarse body hair. The trunk is used for breathing, drinking, and reaching for food. Elephants eat grasses, leaves, and fruit. The African savanna, or bush elephant (Loxodonta africana), of sub-Saharan Africa, is the largest living land animal, weighing up to 16,500 lbs (7,500 kg) and standing 10–13 ft (3–4 m) tall at the shoulder. The African forest elephant (L. cyclotis) is smaller. The Indian elephant (Elephas maximus), of South and Southeast Asia, weighs about 12,000 lbs (5,500 kg) and stands about 10 ft (3 m) tall. Elephants live in habitats ranging from thick jungle to savanna, in small family groups led by old cows. Most bulls live in bachelor herds. Elephants migrate seasonally. They may eat more than 500 lbs (225 kg) of vegetation daily. All species are considered endangered by the International Union for Conservation of Nature and Natural Resources (IUCN).

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