Question

Distinguish between Class Aves and Class Mammalia.

Answer 1

	Aves	Mammalia
i.	Mammary glands are absent.	Mammary glands are present.
ii.	They are completely adapted for aerial life.	They are mostly terrestrial animals with some exceptions like dolphin, bat, etc.
iii.	Body is divided into head, neck and trunk.	Body is divided into head, neck, trunk and tail.
iv.	Exoskeleton is present in the form of feathers.	Exoskeleton is present in the form of hairs or fur.
v.	Digits are covered with scales and bear claws.	Digits are provided with nails, claws or hooves.
e.g.	Peacock, penguin, parrot, pigeon, duck. etc.	Elephant, human, kangaroo, dolphin, bat, etc.