The monkeys, named Roku, Hex and Chimero, were born at the Oregon National Primate Research Center at Oregon Health & Science University. They're the result of mashups made from separate rhesus monkey embryos. Researchers took very early stem cells, called totipotent stem cells, from separate developing embryos and basically glued them together, implanting the mixed embryos into surrogate mother monkeys. The cells — from totally different sources — didn't fuse, but worked together in harmony, forming fully fledged, normal, healthy animals. Watch them do baby monkey things in the video below.