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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