Ancient headless skeletons discovered in mass graves in China, dating back 4,100 years, are believed to be victims of the largest known headhunting massacre in Neolithic Asia. Headless skeletons: According to a study published in the journal Archaeological and Anthropological Sciences, there were 43 victims found in the mass grave, with 32 believed to have been killed during the same event. The skeletons were recovered at the Honghe site in Heilongjiang province in northeastern China, which was first discovered in the 1990s and excavated multiple times since 2013.