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Mammals
Mammals are vertebrate, air-breathing animals. These animals all belong to the class Mammalia. This class is divided into two subclasses: the Prototheria, which includes the oviparous monotremes; and the Theria, which includes the placentals and live-bearing marsupials.
There are over 4000 animals species which are categorised as Mammalia, and there are three subclasses of Mammalia. These are marsupials, monotremes and placental mammals.
 blue lacy Author: TrueBlueLacys GNU Free Documentation License 1.2 |
Corynorhinus townsendii Big eared townsend bat Bureau of Land Management image in public domain |
Hydrochoerus hydrochaeris Capybara Author: Adrian Pingstone image in public domain |
Ateles hybridus Brown spider monkey User: Fir0002 Creative Commons Attribution-Share Alike 3.0 Unported |
Mammals are animals which have certain characteristics; which includes: glands that produce milk, hair, three bones in the middle ear, and a neocortex layer in the brain.
The neocortex provides advance brain functions which, by definition, animals have to have to be mammals:
- sensory perception
- motor commands
- spatial reasoning
- conscious thought
- language
Most marsupials have their young born very immature and are kept in a pouch by the mother, where the young are fed and develop.
monotremes are egg laying mammals. Examples include the duck-billed duck-billed platypus and the spiny anteater.
placental mammals are those animals whose young remain in the womb until they are much more developed. They are nourished and grow from the nutrients received from the placenta. There are many thousands of such mammals.
Odobenus rosmarus rosmarus Atlantic Walruses User: Robbot NOAA image in public domain |
Cervus Mariannus Philippine deer User: Magalh%C3%A3es Creative Commons Attribution-ShareAlike 2.5 Generic |
Cebus albifrons White-fronted Capuchi Monkey User: Diliff GNU Free Documentation License 1.2 |
Condylura cristata star-nosed mole User: Amada44 image in public domain |
 Proboscis monkey User: Quartl Creative Commons Attribution-ShareAlike 3.0 Unported |
 De Brazza's Monkey User: Aaron Logan Creative Commons Attribution 1.0 Generic |