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An extinct quaternary mammal, of great size, allied to the sloth.

One of a group which includes the higher orders of mammals, having a large size as a typical characteristic.

An extinct gigantic quaternary mammal, allied to the ant-eaters and sloths. Its remains are found in South America.

A genus of mammals, including the skunks.

An ovum, as that of a mammal, only partially composed of germinal matter, that is, consisting of both a germinal portion and an albuminous or nutritive one; -- opposed to holoblast.

An extinct mammal of the Horse family, but not larger than a sheep, and having three toes on each foot.

A process projecting backward and downward from the acromion of the scapula of some mammals.

An extinct genus of small Triassic mammals, the oldest yet found in European strata.

One of a group of mammals having a small size as a typical characteristic. It includes the lower orders, as the Insectivora, Cheiroptera, Rodentia, and Edentata.

A white fluid secreted by the mammary glands of female mammals for the nourishment of their young, consisting of minute globules of fat suspended in a solution of casein, albumin, milk sugar, and inorganic salts. "White as morne milk." Chaucer.

A carnivorous mammal of the genus Putorius, allied to the weasel. The European mink is Putorius lutreola. The common American mink (P. vison) varies from yellowish brown to black. Its fur is highly valued. Called also minx, nurik, and vison.

An extinct Miocene mammal of the Horse family, closely related to the genus Anhithecrium, and having three usable hoofs on each foot.

The group that includes all ordinary or placental mammals; the Placentalia. See Mammalia.

Mating with but one of the opposite sex; -- said of birds and mammals.

A subclass of Mammalia, having a cloaca in which the ducts of the urinary, genital, and alimentary systems terminate, as in birds. The female lays eggs like a bird. See Duck mole, under Duck, and Echidna.

A large cervine mammal (Alces machlis, or A. Americanus), native of the Northern United States and Canada. The adult male is about as large as a horse, and has very large, palmate antlers. It closely resembles the European elk, and by many zoölogists is considered the same species. See Elk. Moose bird (Zoöl.), the Cana…

The two anterior of the four lobes on the dorsal side of the midbrain of most mammals; the anterior optic lobes.

The protuberance through which milk is drawn from the breast or mamma; the mammilla; a teat; a pap.

Anat.), the anterior process of the centrum of the second vertebra, or axis, in birds and mammals. See Axis.

A peculiar mammal (Okapia johnostoni) closely related to the giraffe, discovered in the deep forests of Belgian Kongo in 1900. It is smaller than an ox, and somewhat like a giraffe, except that the neck is much shorter. Like the giraffe, it has no dewclaws. There is a small prominence on each frontal bone of the male.…