The human bones are real, as are the horse bones. But they were conjoined and staged by a guy named Bill Willers. According to researcher and forensic-science writer Dolly Stolze at the Strange Remains forensic anthropology website:

And according to Roadside America, Willers “had conceived of the centaur as a way to test the public’s willingness to believe the unbelievable, just as P.T. Barnum did.”

In this day and age, I’m relatively certain I could post the “Volos” photos on Facebook and get at least five people to believe it. And circulate it.