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Ever heard of the gnu goat, the red-eared guenon or the Gila monster?

"Tooth size and proportions, as well as analysis of relative cusp size and shearing crest development clearly separate the fossil from all known guenons," the study's abstract states.

This rare Schmidt’s red-tailed guenon seems to peer right out of the Holy See.

The two Wolf guenons, a species native to Africa, were in their first day at the new lushly planted space at the Ituri Forest exhibit.

The team is now carrying out more research to find out whether guenons are more distinctive from those species they now live beside or those they were living with at the time their species emerged.