the 1990s, but its numbers rebounded in 1996 when three bears were brought from Slovenia. The bear population has bred successfully, and there are now believed to be about 15 brown bears in the central region around Fos, with only four native ones still living in the Aspe Valley. Protected areas Principal nature reserves and national parks: Ordesa y Monte Perdido National Park (Spain) Pyrénées National Park (France) Aigüestortes i Estany de Sant Maurici National Park (Spain) Posets-Maladeta Natural Park (Spain) In 1997, part of the Pyrenees (including Ordesa y Monte Perdido National Park and Pyrenees National Park) was inscribed on the UNESCO World Heritage List for its spectacular geologic landforms and testimony to the unique "transhumance" agricultural system. Demographics and culture The Pyrenean region possesses a varied ethnology, folklore and history: see Andorra; Aragon; Ariège; Basque Country; Béarn; Catalonia; Navarre; Roussillon. For their history, see also Almogavars, Marca Hispanica. The principal languages spoken in the area are Spanish, French, Aragonese, Catalan (in Andorra and in Northern and Southern Catalonia), and Basque. Also spoken, to a lesser degree, is the Occitan language, consisting of the Gascon and Languedocien dialects in France and the Aranese dialect in the Aran Valley. An important feature of rural life in the Pyrenees is 'transhumance', the moving of livestock from the farms in the valleys up to the higher grounds of the mountains for the summer. In this way the farming communities could keep larger herds than the lowland farms could support on their own. The principal animals moved were cows and sheep, but historically most members of farming families also moved to the higher pastures along with their animals, so they also took with them pigs, horses and chickens. Transhumance thus took the form of a mass biannual migration, moving uphill in May or June and returning to the farms in September or October. During the summer period, the families would live in basic stone cabins in the high mountains. Nowadays, industrialisation and changing agriculture practices have diminished the custom. However, the importance of transhumance continues to be recognised through its celebration in popular festivals. Scientific facilities Pic du Midi Observatory The Pic du Midi Observatory is an astronomical observatory located at 2877 metres on top of the Pic du Midi de Bigorre in the French Pyrenees. Construction of the observatory began in 1878 and the 8 metres dome was completed in 1908. The