In Morgoths ring, it is said that Thorondor is a maia spirit inside an animal. My guess is that is somewhat like what happened with dragons: worms inhabited by fell spirits.
I do not have the exact page, but I will look it up. Thorondor had a maia spirit inside of him, and of that Im sure.
And about Ungoliant the Great, and Shelob (last daughter of Ungoliant), Ungoliant was a maia spirit, the maia of darkness. And that is said in the Silmarillion. My guess (again) is that as Melian did, she mated with other fell creatures in form of spiders (but these creatures were not maia), ate them and spawned offspring (check "Of the flight of the Noldor")
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"In place of a Dark Lord you will have a Queen! Not dark but beatiful and terrible as the Dawn! Treacherous as the sea! Stronger than the foundations of the Earth! All shall love me and despair!"
--- Galadriel when tempted by the One Ring.
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