Rooster, don’t kill me, but let me throw this into the mix:
Are they fallen angels or are they demons?
Demons don’t have bodies.
In fact, I'm not exactly sure how to differentiate between demons and fallen angels myself.
I have heard some theologians say they are the same and I have heard some theologians say that demons are the spirits of the dead Nephilim (offspring of fallen angels) and fallen angels are, well, the fallen watchers described in Gen 6 and the Apocrypha (the Ethiopian Book of Enoch--1 Enoch--and others).