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They belong to Vertebrata under Tetrapoda.
They have feather, most fly except some e.g. ostrich
Forelimbs are modified into wings.
They have pneumatic bones, which are hollow with air cavities making them light-weight.
They are warm-blooded.
Heart is 4 chambered.
Sexes are separate.
Fertilisation is direct, no larval stage.
They are oviporous (lay eggs) and development in direct.
E.g. Piegon (Columba), Crow (Corvus)
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