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

(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).

References in periodicals archive ?
The new sign will remind road users to keep an eye out for small wild mammals, in order to lessen the number of collisions involving animals each year.
PTES is asking families going on summer holidays or day trips, car-sharing commuters and anyone else using Britain's roads to record sightings of mammals and submit the records via the free Mammals on Roads app - available on both Apple and Android smartphones.
Among mammals likely to be spotted include hedgehogs, badgers, rabbits, foxes and deer.
The wild mammals you're more likely to spot from your vehicle include hedgehogs, badgers, rabbits, foxes and deer, but there are dozens of other mammals in Britain, so keep your eyes peeled for some of our lesser seen wild neighbours too, such as stoats and otters.
Mohd Tamimi Ali said the Orca Whale is much feared as it is at the top of the list of predators in the marine eco-system food chain and it feeds on squids, turtles, seabirds, sharks and other marine mammals, including seals and dolphins.
"The discovery of Brasilestes raises many more questions than answers about the biogeography of South American Mesozoic mammals. Thanks to Brasilestes, we've realized that the history of Gondwana's mammals is more complex than we thought," Max Langer, a professor at the University of Sao Paulo and leader of the research team, said in the statement.
The Science study did not include marine mammals such as the blue whale, the largest creature that has ever existed, which is listed as endangered in the IUCN Red List of Threatened Species.
Large and small mammals seemed equally vulnerable to temperature shifts throughout that span, the authors said.
Scientists have long thought that the common ancestor to all mammals was active only at night, but the new discovery reveals when mammals started being active and awake in daylight for the first time.
Whereas many of the world's extinct species had very small ranges or small populations or were highly specialised, many now-extinct Australian mammals had extensive distributions (covering more than one million [km.sup.2]) and broad habitat ranges and were very abundant immediately before European settlement of Australia (Hanna and Cardillo 2013).
"Mammals" is a Compare and Contrast title from the Arbordale Publishing series for early readers that teaches young children all about lots of different kinds of mammals.