Does this mean that all three different types are the same species? The ones with wings, the ones like Lyra with horns, and the ones with both? Do they have three genders, and the wings and horn are the difference between them? Or are they unique, but related somehow, like humans and chimps? Could it be possible that the organs are prosthetic, added somehow to enhance them for a particular purpose, and that the ‘plain’ variety pictured in the center is their normal form? Or is that yet another variation of them which I haven’t seen yet, a fourth different kind?