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Question
Describe the important characters of mammals.
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Solution
(i) Mammals are warm-blooded vertebrates. Their body is divisible into head, trunk, neck and tail. Movable eyelids are present.
(ii) Females have mammary glands that secrete milk for the nourishment of the young.
(iii) A muscular diaphragm separates thoracic and abdominal cavities.
(iv) Respiration is through lungs only and the heart is four-chambered. Mammals possess non-nucleated biconcave red blood corpuscles.
(v) Fertilisation is internal, and mammals are known to be viviparous.
(vi) Two pairs of pentadactyl limbs are present. Teeth are thecodont and heterodont. Fleshy external ear (pinnae) is present.
(vii) Hair and subcutaneous fat forms an insulating layer. Cutaneous glands such as sweat glands, scent glands and sebaceous glands are present.
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