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Wednesday, 23 September 2015

Short Notes On Class Aves

Class Aves –

- presence of feather, beak and forelimb in form of wing.

- Hind limb adapted to clasping, walking and swimming.

- No glands on skin (only oil gland at tail base).

- Hollow bones (pneumatic).

- Air sacs connected to lungs to supplement respiration.

- Crop and gizzard are additional chambers in digestive system.

- Warm blooded.

- Heart four chambered.

- Sexes separate.

- Fertilisation internal and development direct.

- eg. Columba, Psittacula etc.


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