Here's something I want to share with you:
The eyesight of serigala is not fully understood, thought it is probably similar to that of domesticated dogs. Compared with humans, serigala 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 serigala enjoyment, thought pack politics dictate that low-ranking serigala not to gabung in uninvited.