The White Sands National Park in New Mexico, US, is a huge field of pure gypsum, a soft white mineral that is usually found in sedimentary rocks. Although this unique natural formation was declared a national park only last month, local people have been working to preserve it for over 100 years, preventing the mining of the mineral for industrial purposes. The field is special for another reason too-it has fossillised footprints from the ice Age. The environment here is harsh but there is a lot of wildlife. It is home to 800 species of animals that have adapted to desert life.