Musk oxen have been roaming around, being totally cool since the last Ice Age. Why are they cool? Well, they live in the Arctic, so they are literally cool. They are vegetarians, which is universally viewed as cool. They secrete a stinky funk or musk in order to attract Lady Musk oxen. Their soft underwool, qiviut, is highly prized as awesome sweater material and they just cast it off in the summer. . . no big deal.
They just play it cool, bro.