Peru's ancient spiral-tailed monkey is losing its tail. Extensive high-resolution aerial photos of the famed Nazca Lines taken by Peru's air force showed destruction Thursday that conservationists have long feared. Tire tracks and disregard for the site are irreparably scarring the mysterious lines and animal figures that a pre-Columbian civilization etched into a 56-kilometre stretch of Peru's southern desert centuries ago. In the first comprehensive aerial photos taken by Peru's government since 1973, one of the most famous animal figures, the monkey, was crisscrossed by tire tracks nearly obliterating the top of its tail. The fish and spider lines showed similar scars in the 180 photos taken last month and published in local newspapers. Denouncing the damage, Congressman Luis Gonzales said he would urge legislators to take urgent action to protect the site, which was added to the United Nations World Heritage list in 1994. "This is extremely grave," he said. "When the photographs are presented to the international community, it will unleash a scandal because it involves human patrimony." Some of the worst damage has occurred since the death in 1998 of German mathematician Maria Reich, who at 95, had devoted five decades of her life guarding the 450-square-kilometre protected zone.