If you notice on the Haranir model, the Quils that show are the same ones that the Quilboar have. As to the Trolls and Night Elves, we basically know the Trolls and Night Elves share ancestry through the Dark Elves which leads me to believe that on the Haranir model which has quils, ties the Quilboar to a shared ancestry with the Trolls and Night Elves. It is also possible that the Quilboar have practiced Druidism. We also know that when Agamaggan fell thorns emerged out of Azeroth. If you look closely at the roots we see in TWW and the thorns in both Northern and Southern Barrens they closely resemble the roots in Azj-Khahet. It’s also possible that the fur on Haranir resemble the one we see on the Tauren. It’s also possible that the Tauren share ancestry with the Night Elves, Trolls, and Quilboar. I’m sorry for the long post but this started nagging at my brain and I felt the need to say something.