Distinguish between Class Aves and Class 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.|
Concept: Kingdom Animalia - Chordata: Vertebrata
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