In the December 27, 2004 article "Tribal rock art offers clues to religious beliefs of old", Paul Allen of the Tucson Citizen writes about rock art on a mountain ledge near Fort Huachuca, about 70 miles southeast of Tuscon, Arizona, near the border to Mexico.
The article has a photo by Tanja Linton of one of four large eagles (each about 4 feet from wingtip to wingtip) painted on this rock face.
The rock face at Fort Huachuca also has a figure in a colored skirt and headdress painted on it, together with a large serpent extending ca. twelve feet across, with the serpent's head at the human figure's hand.
Based on our decipherment of Hueco Tanks near El Paso as marking Serpens Caput in the ancient survey of the Americas by astronomy (Hueca Tanks is also on the border to Mexico nearly due East of Fort Huachuca), Fort Huachuca then marks the stars of Aquila (the Eagle) and Serpens Cauda (the tail of the serpent) in this ancient survey.
Obviously, the four eagles mark the Eagle, Aquila, also perhaps representing each of the four major stars making up the diamond-shape of this stellar constellation.
The serpent at Fort Huachuca will surely mark Serpens Cauda.
The motif of eagle and serpent for this part of the heavens is also prevalent in the Old World. (See Richard Hinckley Allen, Star Names: Their Lore and Meaning under "Aquila".)