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Petroglyphs often give a hint of wildlife that was abundant in an area in times past, such as these bighorn sheep.
Grapevine Canyon, Lake Mead NRA, near Searchlight, NV (1992).
Though petroglyphs date mostly from pre-contact times, men on horseback do appear.
Newspaper Rock SP, near Monticello, UT (1981).
Desert water sources are often associated with petroglyphs, as here along the Gila River.
Painted Rocks SP, near Gila Bend, AZ (1987).