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Dwarves and ents are rational peoples, but not Children or Ainur: why should there not be a race of sentient eagles on the same basis?
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Actually, Eru called the dwarves his adopted children so you can classify dwarves as Children of Eru.
As far as Ents go-
Quote:
and it will summon spirits from afar, and they will go among the kelvar and the olvar, and some will dwell therein
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This is in the Sil when it talks about the birth of the Ents. It says that Ents are "spirits from afar" but what does that mean? For all we know, they are Ainu spirits. Or maybe not.
Well, no matter, it's not important to my point which is- Dwarves and Ents appear to be rational creatures (they have a fea) but note that both were specifically addressed by Tolkien. He made sure and said that Ents had spirits and that Dwarves were adopted by Eru.
If there were another race of beings with a fea I seriously doubt that Tolkien would've skipped mentioning it.