A few more headcanon anatomical illustrations of the Irkens, this time focusing on head. I don't think a full article is needed here, I'll just clarify a couple of points.
I forgot to mention in the art that the antennae also serve as hearing organs, just like the auditory openings, but they pick up different frequencies. They are good at determining the direction of sound but poor at distinguishing the sound itself. In other words, if you plug an Irken's "ears" (the openings) and speak to them, the antennae won't be able to decipher speech. They also function as thermoregulatory organs and as sensors for environmental temperature analysis (thermoreception).
Irkens have 20 teeth in total, 10 on each jaw. They are proportionally smaller than human teeth, not tightly packed together, and slightly more fragile – unsuitable for chewing anything very tough or hard, such as meat or bones. The jaws are proportionally smaller and narrower than human ones.
The eyes have no iris and, consequently, no pupil. The lens is cone-shaped, concave inward, and it is this central part that performs the role of focusing light – similar to how the human pupil works. And since without an iris the retina would be oversensitive to bright light, the cornea has a special structure that filters specific wavelengths of light.
And yes, their skin is fuzzy, like humans'. Little green fluffballs ♡
