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Chickens are birds It's just that they can't fly. Incase you didn't know, an ostrich is a bird too. Thier body doesn't posses the morphological features that supports flight that's all.
Chickens posses every characteristics of a bird from thier morphology to thier mode of reproduction it's just that they are among the flightless birds.
Some examples of flightless birds includes peacock, chickens, ostriches,penguins etc.
So there you have it. A chicken is a bird.