(i) Their body is covered with feathers.
(ii) They are warm-blooded animals and maintain their body temperature constant.
(iii) They lay eggs, which have a large amount of yolk.
(iv) The forelimbs – are modified into wings, jaws are prolonged into a beak, and do not have teeth.
(v) Their bones are hollow to make their body light, to help in flying,
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