 It makes it difficult to determine which group or groups took part in the implementation of the Boca de Potrerillos petroglyphs.However recent archaeological work by authors such as William B. Murray, Solveig A. Turpin, Herbert H. Eling Jr., and others have provided understanding of the cave art and artists at Boca de Potrerillos.For the Nahuatl speaking Aztec society the groups living in what is now northern Mexico and Southwestern United States were called Chichimec’s (an insult in Nahuatl) in referring to them as savages.