Some skeptics eyed Teilhard de Chardin, a French Jesuit priest and prominent paleontologist, who discovered a canine tooth that figured prominently in the skull's identification.

These included an ape-like jaw fragment, complete with molars and a canine tooth, some human-looking cranial parts, plus assorted stone tools and ancient mammal remains.

Both Arktos and Walker have now had dental work done Arktos' subdued behaviour alerted staff to a problem with his upper left canine tooth.