Humans who can change into them? Well then that's certainly an interesting predicament. I've never been sure what to classify shape shifting as. If its biological or magical. I just know it has something to do with souls with the individual.
Heh yeah I guess. Its iron because they eat fae, but its also because their bones are metallic. So technically the beak is all metallic cartilage. Ah excuse me, I'm getting carried away.