In the same section of the Silmarillion, 'Of Aule and Yavanna', once the ents are accounted for, Yavanna and Manwe remember in the Song their thoughts 'taking wing like birds together'. Manwe says 'By the heed of Iluvatar and before the Children awake there shall go forth with wings like the wind the Eagles of the Lords of the West'. These are special creations, given being by Iluvatar, not just big birds.
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