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Write the general characters of the clas...

Write the general characters of the class Aves.

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1. They have feathers on the body.
2. The forelimbs are modified into wings. The hind limbs are adapted for walking, running, swimming and perching.
3. The skin has oil gland.
4. The exoskeleton consists of feathers, scales, claws on legs.
5. The bones are pneumatic.
6. Respiration is by lungs with air sacs.
7. The heart is four chambered with right systemic arch.
8. They are homeothermic.
9. Migration and parental care are seen.
10. Urinary bladder is absent.
11. Females have only left ovary.
12. They are oviparous. The eggs are cleidoic.
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