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characters of mammals

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smzaheer | eNotes Newbie

Posted October 2, 2013 at 6:45 AM via web

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characters of mammals

Tagged with mammals, science

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pratyushpandey | Elementary School Teacher | eNoter

Posted October 2, 2013 at 7:23 AM (Answer #1)

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1.mammals are warm blooded (endothermic and homeothermic) and most evolved animals of animal kingdom
2.hairs and subcutaneous fat form an isulating layer. cutaneous glands such as sweat glands, scent gland, and sebaceous(oil) glands are present 
3.body divisible in head, neck, trunk and tail. moveable eyelids
4.respiration is by lungs

5.a muscular diaphragm seprates thoracic and abdominal cavities

6.females have milk producing mammary glands which secret milk for the nourishment of the young 
7.fleshy  external ear (pinnae) present. middle ear with three ossiclex (malleus, incus and stapes).

8.teeth are thecodont (embedded in sockets in the jaws) and are hetrodont (differential into incisors, canines,premolars and molars).

9.two pairs of pantadactyl limbs are present. digits in the fore limbs and hind limbs are never more than five and ending in claws, nails and hoofs.limbs are variously adapted for waliking, running, climbing, burrowing, swimming or flying

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orchid101 | College Teacher | (Level 1) Associate Educator

Posted October 2, 2013 at 10:55 AM (Answer #2)

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Mammals are dominant animals that inhabit diverse environments. Their distinctive features are milk-producing mammary glands, hair on the body, sweat glands, external ear and a diaphragm. They produce two sets of teeth. They maintain a constant body temperature ( warm blooded) and exhibit elaborate parental care. The heart is four chambered. The brain is large with a wider range of intelligence. Mammals are viviparous with the exception of two eggs laying mammals, the platypus and echidna.

Source:

http://www.enotes.com/topics/mammals

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