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Mammal Classification

Mammal Characteristics and Classification
by Owen Borville
March 8, 2021
Biology, Science, Learning

The most defining mammal characteristics include mammary glands, hair or fur covering the body, and three middle ear bones.

​Other common characteristics include sweat glands, warm-blooded body systems, live births, mammary glands, special teeth, four-chamber heart, a complex brain, vertebrae, and bilateral symmetry.

Other common features of mammals include four limbs and a tail for land mammals. Marine mammals have fins, commonly four fins or five for dolphins.


Mammals are animals
that are commonly classified and defined by their method of reproduction: placentals (placenta), marsupials (pouch), or monotremes (egg laying).

Placentals are mammals that give birth by way of a placenta organ that nourishes the baby while in the mother's uterus chamber. The placentals are the largest group of mammals and are a diverse group that are difficult to classify, showcasing the uniqueness of these animals in terms of a special creation.

Placental mammals include the aardvarks, anteaters, bats, primates, carnivores (cats, dogs, bears), rabbits, rodents, even-toed hooved animals (deer, antelope, camels, hippos), elephants, odd-toed hooved mammals (horses, zebras, rhinos, tapirs).

Marine placental mammals include the whales, porpoises-dolphins, seals-sea lions, and manatees/dugongs. The pangolin is the only mammal totally covered with scales while the armadillo is also a unique placental mammal that features scales minus the underside.

Marsupials are mammals that give birth to live offspring that are raised in the pouch on the mother's belly. The offspring are born not fully developed and must develop in the mother's pouch by suckling. Most marsupials are found in Australia and New Guinea, but some are found in North and South America. This unique feature of the marsupials showcases the uniqueness of these animals and the difficulty of classification. The most well known marsupials are the kangaroos, wallabies, koalas, opossums, wombats, and Tasmanian devils. 

Monotremes are the unique egg-laying mammals, the smallest group of mammals and are found mainly in Australia and New Guinea. Monotremes are comprised mainly of the platypus and the echidna. Monotremes are called "primitive" by mainstream evolutionist scientists because they lay eggs, similar to the reptiles that also lay eggs and supposedly form an evolutionary line. However, monotremes are substantially different than reptiles and are unique in many ways.
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