It's hard to find a good comparison of ETs, demons, jinn, etc. all in one place. It would be nice to be able to put them side by side. I am currently working on such a list, but it will take awhile.
Here is a list of the characteristics of demons:
Characteristics of Demons
I was actually amazed that the very early church discussed the characteristics of demonic entities and fallen angels so in-depth, and there is so much information you can garner from it by inference (such as the fact that demons and fallen angels CAN reproduce), and the apparent need of demons for liquid substances such as blood or wine in order to survive (kinda like the way the greys supposedly get nourishment by applying a substance to their skin). Also that demons speak telepathically, can cloak themselves, shapeshift, etc. (the former two being characteristics of some UFO sightings)
Does anyone know of any good links on the characteristics of ETs and UFOs?