Early Humans Made Animated Art
nautil.us
nautil.us
More images from the Chauvet cave that might be interesting to see in that light:
https://kerritargett.files.wordpress.com/2012/10/cave-painin...
http://4.bp.blogspot.com/-OKDK4Aq9HbE/TdEpBomuxQI/AAAAAAAABZ...
http://www.warrencriswell.com/The%20Membrane/chauvet-rhinos-...
Also the superb documentary about Grotte Chauvet, "The Cave of forgotten dreams" by Werner Herzog talks about animation: