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Notes On AVES

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Published in: Biology
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CHARACTERISTICS OF AVES.

Fatima J / Hyderabad

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  1. CHARACTERISTICS OF AVES 1. They are cosmopolitan. 2. They are warm blooded. 3. Their body temperature is over 100 F. 4. They expend a lot of energy to keep warm. 5. Forelimbs are modified into wings. 6. The hind limbs are used for perching, walking, hopping, wading, swimming etc. 7. There are no skin glands except oil gland. 8. Body is divisible into head, neck, trunk and tail. 9. Heart is large and has four chambers. 10. R.B.C. are oval, nucleate and biconcave. Bones are pneumatic, i.e. contain air cavities to 11. reduce weight. 12. 13. 14. 15. 16. 17. 18. Brain is well developed. Sexes are separate. Birds are oviparous. They lay big sized eggs. Eyes are well developed. Monocular vision. Fertilization is internal. They have 12 pairs of cranial nerves. The voice is produced by a special organ, the syrinx. 19. They have a sharp sight. 20. The endoskeleton is bony, but delicate and light.
  2. ww tern albatross 21. cockatoo macaw toucan

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