What are the differences between animals belonging the Aves group and those in the Mammalia group.

Differences between Aves and Mammalia:


Aves



Mammalia



Body is covered with feathers.



Body is covered with hairs.



Bones are hollow with air cavity for flying.



Bone is not hollow.



They are oviparous.



They are viviparous with few exceptions



Mammary glands are absent



Mammary glands are present for nourish their young ones.



Teeth are absent



Teeth are present.



Diaphragm absent.



A muscular diaphragm separates thoracic and abdominal cavities.




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