User blog comment:Mckrongs/Jinouga Subspecies Discussion/@comment-125.162.226.71-20111120095850/@comment-1011548-20111127211807

Biology nerd? You are my new favourite anon! Personally, I don't think Khezu and Gigginox are very related. They have completely different (well, kinda) body structures and different ways of hunting. Any similarities between them can be put down to convergent evolution; both fill the same niche in the same kind of habitat, so it's only natural they'd stumble onto the same answers for certain environmental pressures. For example, both are blind, rely on other senses, have lost pigmentation (forget the subspecies) and are well-adapted for climbing around on cave walls. Which is good, since they mainly live in caves and all...

My money is on Dragon Element being a form of electro-magnetism or something. Rukodiora basically breathes dragon element, and he's not called 'Pole Dragon' for nothing.