I always had the impression that Ents, Eagles, and Dragons were lesser Ainu (or at least
eala) spirits. The Ents and Eagles are described as receiving 'spirits from afar' (I think the quote was posted a couple posts ago) which implies their spirits pre-existed their bodies; which would make them
ealar incidentally embodied rather than
fear as the spirits of Men, Elves etc.
fea =soul of an Incarnate like the Children of Iluvatar, Dwarves;
eala = spirit naturally disembodied, but can take on form by 'self-arraying' or become incarnate (Morgoth, Sauron, Istari etc.) The Ainur are all
ealar, but it's never stated if all
ealar are Ainur, and some texts suggest there might be at least non-Maia-non-Vala
ealar (the Valaquenta says that the Aratar surpass "beyond compare all others, whether of the Valar and the Maiar, or of any other order that Iluvatar has sent into Ea.") 'Sent into Ea' implies
ealar spirits since Men, Elves etc. were created within Ea.
Quote:
Originally Posted by Finwe
the Valar probably let Melian "reproduce" with Thingol.
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Somewhere in HOME (probably Morgoth's Ring) Tolkien says that Ainur reproducing in incarnate form acts to bind them to their bodies. It seems to be an ability they naturally possess and not something that needs a special dispensation (which Ungoliant in any case wouldn't have received).
I don't think a clear answer on the 'was Thorondor a Maia' question is really possible, since Tolkien wrote both, but to me the version where the original Eagles of Manwe were minor Maiar embodied in permanent physical forms (analogous to the Istari perhaps) seems the firmer one.