Roku and Hex look like any other cute baby monkeys as they roll around together playfully, but the unique pair were actually created by scientists from the genes of up to six different animals.

Boasting the title of the world's first “chimeric monkeys” the primates were genetically engineered from the early-stage stem cells taken directly from monkey four-cell embryos to create 10 chimeric embryos that were then implanted into female monkeys, reported USAToday.com.

The scientific breakthrough was developed by experts at the Oregon National Primate Research Center, led by stem cell developmental biologist Masahito Tachibana.