mammal

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mammal

 [mam´al]
an individual of the Mammalia, a division of vertebrates, including all that possess hair and suckle their young. adj., adj mammal´ian.

mam·mal

(mam'ăl),
An animal of the class Mammalia.

mammal

/mam·mal/ (mam´'l) an individual of the class Mammalia.mamma´lian

mammal

(măm′əl)
n.
Any of various warm-blooded vertebrate animals of the class Mammalia, including humans, characterized by a covering of hair on the skin and, in the female, milk-producing mammary glands for nourishing the young.

mam·ma′li·an (mă-mā′lē-ən) adj. & n.

mammal

any animal of the class Mammalia, a group of about 4250 species, often regarded as the most highly evolved animals, and so named because they all possess MAMMARY GLANDS. There are three living subclasses:
  1. Monotremata - MONOTREMES, primitive egg-laying mammals such as the duck-billed platypus and Echidna, the spiny ant eater.
  2. Marsupialia - MARSUPIALS, which transfer their young to pouches for the latter part of their early development.
  3. Eutheria - EUTHERIANS, which have a placenta.

Mammals are characterized by the presence of hair, a DIAPHRAGM used in AERIAL RESPIRATION, milk secretion in the female (LACTATION) for suckling the young, presence of only the left systemic arch in the blood circulatory system, three auditory ossicles in the ear, and a lower jaw of a single pair of bones. In all classes except the monotremes, the young are born live (see VIVIPAROUS).

mammal

an individual of the class Mammalia, a division of vertebrates, including all that possess hair and suckle their young.

eutherian m's
true placental mammals which develop chorion, amnion, yolk sac and allantois, all of which contribute to the placenta. Called also placental mammals.
metatherian m's
marsupials including kangaroos, opossums which are born after a brief period of development and spend a long time being nurtured by the mother, usually in a pouch or marsupium.
placental mammal
see eutherian mammals (above).
prototherian m's
monotremes, the egg-laying mammals.