Pictograph showing a big-horned sheep pierced by three arrows. The body is divided by geometric and decorative lines, which undoubtedly have symbolic meaning. Roughly picked, the implied shapes are easily recognizable (curved horns, hooves), an effect achieved by means of finer incising. Length: 28 inches. Three Rivers Petroglyph Site, north of Alamogordo (New Mexico). There are around 5,000 petroglyphs in this historic area: animals, representations of humans, geometric and abstract shapes.