Q. Which of the following is not a flightless bird?

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Solution:

Examples of Class Aves:
Flying birds - Passer (Sparrow), Corvus (Crow), Psittacula (Parrot), Columba (Pigeon), Pavo (Peacock National bird), Neophron (Vulture).
Flightless birds (Ratitae group) - Struthio (Ostrich), Rhea, Emu.
Others - Aptenodytes (Penguin).