— 3,598 structures in all — for 13 days after the earthquakes and found damage totaled $5.2 billion. Replacing buildings alone would cost $2.2 billion, but officials also must replace or repair specialized equipment, furniture, machine tools, telecommunication assets and other facilities. Weapons developed at China Lake AAM-N-5 Meteor AIM-9 Sidewinder AGM-45 Shrike AGM-62 Walleye BOAR (rocket) China Lake Grenade Launcher CL-20 Gimlet (rocket) Holy Moses (rocket) Hopi (missile) LTV-N-4 Ram (rocket) RUR-4 Weapon Alpha SLAM-ER Terasca Tiny Tim (rocket) Tomahawk missile Other notable projects Glowstick NOTS-EV-1 Pilot Environment Wildlife The majority of the land at NAWS China Lake is undeveloped and provides habitat for more than 340 species of wildlife, including feral horses, feral burros (donkeys), bighorn sheep and endangered animals, such as the desert tortoise, Mojave ground squirrel and Mojave tui chub. The Mojave tui chub was introduced to China Lake's Lark Seep in 1971. Lark Seep is fed by the water outflow from a waste water treatment plant located at China Lake. The tui chub population has since grown and expanded to a population of around 6,000 in 2003. The desert on which the installation is built is home to 650 plant types. Petroglyphs The area was once home to the Native American Coso People, whose presence is marked by thousands of archaeological sites; the Coso traded with other tribes as far away as San Luis Obispo County, California. This locale was also a site used by European miners and settlers whose cabins and mining structures are extant throughout the Station. The Coso Range Canyons are home to the Coso Rock Art District, an area of some which contains more than 50,000 documented petroglyphs, the highest concentration of rock art in the Northern Hemisphere. The precise age of the petroglyphs is unknown. A broad range of dates can be inferred from archaeological sites in the area and some artifact forms depicted on the rocks. Archaeologists do not agree on their age, but in general it is believed that most petroglyphs are between one and three thousand years old. Designs range from animals to abstract to anthropomorphic figures. Opinions vary widely whether the petroglyphs were made for ceremonial purposes, whether they are telling stories to pass along the mythology of their makers, or whether they are records of hunting hopes or successes, clan symbols or maps. Declared a National Historic Landmark in 1964, the rock art in Little