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प्रश्न
Distinguish between Class Aves and Class Mammalia.
फरक स्पष्ट करा
उत्तर
| 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. |
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