How human skulls have changed over the centuries
14 March 2012 Last updated at 16:25 GMT
The remains of what may be a previously unknown human species have been identified in southern China.
The bones, which represent at least five individuals, have been dated to between 11,500 and 14,500 years ago.
Dr Isabelle De Groote, a palaeoanthropologist from the Natural History Museum, shows how human skulls have changed over the last 100,000 years.