were created. Blue butterflies can commonly be seen drinking from the snowmelt; some species of blues fly as high as . The butterflies tend to be large, such as those from the swallowtail Parnassius family, with a habitat that ranges to . Twelve species of beetles have habitats up to the snow line; the most beautiful and formerly collected for its colours but now protected is Rosalia alpina. Spiders, such as the large wolf spider, live above the snow line and can be seen as high as . Scorpions can be found in the Italian Alps. Some of the species of moths and insects show evidence of having been indigenous to the area from as long ago as the Alpine orogeny. In Émosson in Valais, Switzerland, dinosaur tracks were found in the 1970s, dating probably from the Triassic Period. History Prehistory to Christianity About 10,000 years ago, when the ice melted after the Würm glaciation, late Palaeolithic communities were established along the lake shores and in cave systems. Evidence of human habitation has been found in caves near Vercors, close to Grenoble and Echirolles; in Austria, the Mondsee culture shows evidence of houses built on piles to keep them dry. Standing stones have been found in the Alpine areas of France and Italy. The Rock Drawings in Valcamonica are more than 5000 years old; more than 200,000 drawings and etchings have been identified at the site. In 1991, a mummy of a neolithic body, known as Ötzi the Iceman, was discovered by hikers on the Similaun glacier. His clothing and gear indicate that he lived in an alpine farming community, while the location and manner of his death – an arrowhead was discovered in his shoulder – suggests he was travelling from one place to another. Analysis of the mitochondrial DNA of Ötzi, has shown that he belongs to the K1 subclade which cannot be categorized into any of the three modern branches of that subclade. The new subclade has provisionally been named K1ö for Ötzi. Celtic tribes settled in Switzerland between 1500 and 1000 BC. The Raetians lived in the eastern regions, while the west was occupied by the Helvetii and the Allobrogi settled in the Rhône valley and in Savoy. The Ligurians and Adriatic Veneti lived in north-west Italy and Triveneto respectively. Among the many substances Celtic tribes mined was salt in areas such as Salzburg in Austria