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Dragons,Ungoliant, Ents and Eagles:
Originally Maia but became essentially incarnates upon reproduction.
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I do not believe that Ents and Eagles were originally Maiar. Eru heeded Yavanna's prayer and aided in the creation of the Ents, the Sherperds of the Trees, that they may defend the olvar, the trees and plants, from the axes of the Dwarves.
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"When the Children Awake, then the thought of Yavanna will awake also, and [the Ents] will go among the kelvar and the olvar, and some will dwell therein, and be held in reverence, and their just anger shall be feared"
-Eru Illuvatar speaking through Manwe Sulimo
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The fact the Eru created them does not make them Maiar (for he did also create and give life to Elves and Men, and they are not classified as Maiar). The Eagles of Manwe, similarly, were first conceived in the Song of the Ainur, and thus they came to Be, not Maiar nor Valar.
As for Ungoliant and the Dragons, it must be assumed that their case is similar to that of the Balrog's, spirits created by Illuvatar and corrupted by Morgoth, thusly under his dominion until their deaths. For Morgoth did not create any of these, having not the power to make life but only to mock it. It must therefore be assumed that he simply corrupted these spirits and trapped them in shells of flesh.