I can't be 100% sure about this, but I think I remember hearing/reading something saying that he's kind of like a bird the way his face is made... (in fact I believe there are theories connecting birds and mudokons trying to explain why mudokons have such a strong link with birds)
So that
could mean that he simply has small "nostrils" on his "beak" (and you have to admit, that part of the face does look kinda like a beak) that allow him to breathe/smell/etc. But like I said, I'm not completely sure about this, and even if that is what was said, it's not necessarily right
