A species of Asian "murder hornets" has appeared in the U.S. as researchers search for ways to eradicate the vicious insects before populations grow. The hornets were discovered near Custer, Wash., last November when beekeeper Ted McFall found carcasses of his bees with decapitated heads, according to an interview with The New York Times. McFall told the Times that he could not imagine what could have killed his bees, later discovering that it was the result of a murder hornet attack. The Asian hornets are reportedly enormous, with queens growing as long as two inches.