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Thank you. General Characteristics And Classifications of Aves B.Sc 2nd Year||Birds #aves #chordates . what is preen gland. uropygial gland. pieagion milk kya hota he. digestive systems of birds.pygostyl. synsacrum. furcal. keel of birds. flighting adaptation in birds. general characterstics of birds. avian classifications. neet animal kingdom. animal kingdom for 11th biolology. chordate classification.