The eyesight of Người sói is not fully understood, thought it is probably similar to that of domesticated dogs. Compared with humans, Người sói have three to four times the density of light-sensing rods in their retinas, which gives them keener night vision. Yet because they lack a fovea (the tiny pit on the retina) they cannot match a human's ability to focus on objects at a long distance.
The eerie, harmonic chorus howl so engrained in our collective unconscious is used both defensively and to rally the pack. Chorus howling also brings the Người sói enjoyment, thought pack politics dictate that low-ranking Người sói not to tham gia in uninvited.
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