Flying birds (Carinatae) | Flightless birds (Ratitae) |
1. Usually small in size | Usually large in size |
2. Well developed wings | Poorly developed wings |
3. Interlocking mechanism in feathers is present | Absent |
4. Tail quills are present | Absent |
5. Oil gland is present | Absent |
6. Well developed flight muscles | Reduced fight muscles |
7. Keel is present in breast bone | Absent |
8. Short legs | Long and stout legs |
9. Copulatory organ is absent in males | Present |
10. The young are naked without feathers (altricious) | The young are with feathers (precocious) |
11. Cosmopolitan distribution (found everywhere) | Discontinuous distribution |
12. E.g. Crow, Columba, Parrot etc | Struthio, Kiwi, Penguine etc |
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Good and very useful to the up cming bio or zoology students also nd to all
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