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.