How chicken included in the birds category

because the main features of aves are-
1) they have characteristic feathers over there body.
2)the have hollow bones known as pneumatic bones.
3)they are warm blooded.
4)they have beaks instead of teeth
5)they have the most richest blood (means there is more RBCs in there blood than any other animals)
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and these all features are found in the chickens
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they have aves less fly but fly
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