In this nonfiction book, Arnold describes some of the over 100,000 examples of petroglyphs (some possibly up to 18,000 years old!) which were made in the Coso Range which is located about 200 miles northeast of Los Angeles in the northern Mojave Desert. Some of the animals depicted in the rock pictures include bighorn sheep, deer, mountain lions, coyotes, lizards, tortoises, and quail. Many of the petroglyphs also depict hunters and weapons. Besides being interested in the age of the rock pictures, and how the petroglyphs were made, students may also be intrigued by the mystery behind the glyphs. The author explains how we do not know who made the first glyphs. According to Shoshone people in the 1800s, the rock pictures had been made by "old ones" who lived in the area long ago. Many people believe the rock-art sites were thought to be places with special power and were created as part of religious rituals. The author ends her book with a list where the interested reader can see ancient rock art in the United States (four locations in California), a glossary, and an index. The photographs by Richard Hewett add a lot to the text and children may enjoy looking for the rock images which are being described in the text. ( )