I asked myself this question right after reading Souls of the Never.
I mean, the short prequel Origins of the Never had some magnificent specimens of dragon kind. But besides a few dead dragon carcasses, there were none to be found in the story itself.
Or so I thought, until I read Worlds of the Never. I can't believe how blind I was! They were there in front of my eyes the whole time. Granted, even the characters in the book aren't aware of their place in the whole plan, but I should have seen it. All the clues are there.
I won't spoil it for the rest of you humans. Read the books. Find the dragons.