That's what I was refering to.

When you get down to similar morphology, how many air breathing animals do you know that breathe through nose or mouth? All of them? Water breathers don't, and insects are different, but only the cetaceans are particularly different, and no air breathing animal is all that different. However, on Pandora, it appears that a good number of animals breathe through an orifice in the neck, though the Na'Vi don't. Why not? Probably, there is no sound biological reason, simply a political reason.

Biologists would be all over that world.