Legate, Tolkien actually states that the Eagles had no spirit:
Quote:
Originally Posted by Morgoth's Ring, Myths Transformed
The same sort of thing may be said of Huan and the Eagles: they were taught language by the Valar, and raised to a higher level - but they still had no fëar.
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Can we assume this is a canonical conclusion? Tolkien states it very conclusively, and it is, as far as I know, his last word on the subject.