Board Thread:Questions and Answers/@comment-28019357-20160320235151/@comment-84.168.206.184-20160508165859

But I wonder why their fangs were not seen? Or it was never discovered that they have no body heat?

In the anime AND the manga their fangs are always clearly visible and in the light novel "human" Crowley talks A LOT with "vampire" Ferid. He doesn't realize that Ferid is a vampire at all. And the "human" Crowley depicted in the light novel is far from dumb or inattentive. Just to give an example.

How is that possible?