What was Shelob, and more importantly, what was Ungoliant?

[Lord Gothmog]

Originally Posted by Eönwë

So does that mean that possibly Gandalf could incarnate? He is made like a man, with all susceptibility, and weakness of the flesh. He might be able to reproduce. He had to live as a man, so he had everything that goes with it.

It is not impossible that the bodies of the Istari could well be capable of reproduction, though that seems to have been a very low priority to all of them.