This question and others tantalize researchers investigating early paintings in some of Europe's caves. The paintings date back to a time when Neanderthals and early modern humans lived side by side.
Read more about the first artists online in National Geographic magazine's "Firsts" issue.Display image courtesy Stephan Alvarez; Department of Education, Culture, and Sport of the Government of Cantabria, Spain.
Originally published December 15, 2014
