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.
References in periodicals archive ?
Aware of the need to save stranded mammals, residents of Barangay Allasitan in this town and the Bureau of Fisheries and Aquatic Resources (BFAR) work together to save a 1.
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Project officer Dr Vivien Kent, said: "We are thrilled to have received the support of the Heritage Lottery Fund and are confident the project will contribute to our knowledge of the North East's mammal populations through a wide network of citizen science volunteers.
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The University of Colorado Boulder team eventually selected 140 scientific papers containing population responses from 73 North American mammal species for their analysis.
They are also the most diverse mammal group and includes rodents, whales and humans.
Annual growth lines etched in the leg bones of 115 wild warm-blooded mammals such as giraffes, reindeer and gazelles are similar to those previously seen in the remains of dinosaurs and other reptiles, researchers report online June 27 in Nature.
The Vincent Wildlife Trust and Countryside Council for Wales want people to help to spot the mammals and signs of their presence in selected patches of forest.
About 125 million years ago, this bug-eating mammal glided through the skies of China.