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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.

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.…

A group of ungulate mammals including the hog and the hippopotamus. The term is also sometimes applied to the bears, and to certain passerine birds.

In many mammals, an interarticular cartilage, or bone, between the sternum and the clavicle.

A half oviparous, or an oviparous, mammal; a marsupial or monotreme.

g certain important characters in common; as, the Carnivora and Insectivora are orders of Mammalia.

A genus of extinct herbivorous mammals, abundant in the Tertiary formation of the Rocky Mountains. It is more or less related to the camel, hog, and deer.

A genus of American Eocene mammals allied to the horse, but having four toes in front and three behind.

ry to the exterior of the animal or to the part where further development takes place. In mammals the oviducts are also called Fallopian tubes.

The formation of ova or eggs in the ovary, and the discharge of the same. In the mammalian female the discharge occurs during menstruation.

A group of hoofed mammals distinguished for the thickness of their skins, including the elephant, hippopotamus, rhinoceros, tapir, horse, and hog. It is now considered an artificial group.

Any one of several species of East Indian viverrine mammals of the genus Paguma. They resemble a weasel in form.

An extinct genus of herbivorous Tertiary mammals, once supposed to have resembled the tapir in form, but now known to have had a more slender form, with a long neck like that of a llama. [Written also Palæotherium.]

Putting the whole foot upon the ground in walking, as some mammals.

A small Asiatic mammal (Ailurus fulgens) having fine soft fur. It is related to the bears, and inhabits the mountains of Northern India.

A web or fold of skin which extends between the legs of certain mammals, as the flying squirrels, colugo, and phalangister.