Diorama,_cavemen_-_National_Museum_of_Mongolian_History

“Diorama, cavemen – National Museum of Mongolian History” by Nathan McCord, U.S. Marine Corps – http://www.defenseimagery.mil; VIRIN: 090812-M-7376M-073. Licensed under Public domain via Wikimedia Commons – http://commons.wikimedia.org/wiki/File:Diorama,_cavemen_-_National_Museum_of_Mongolian_History.jpg#mediaviewer/File:Diorama,_cavemen_-_National_Museum_of_Mongolian_History.jpg