ravens, crows and magpies migrating into Ljubljana and Maribor where they thrive. Other birds include black and green woodpeckers and the white stork, which nests mainly in Prekmurje. There are 13 domestic animals native to Slovenia, of eight species (hen, pig, dog, horse, sheep, goat, honey bee, and cattle). Among these are the Karst Shepherd, the Carniolan honeybee, and the Lipizzan horse. They have been preserved ex situ and in situ. The marble trout or marmorata (Salmo marmoratus) is an indigenous Slovenian fish. Extensive breeding programmes have been introduced to repopulate the marble trout into lakes and streams invaded by non-indigenous species of trout. Slovenia is also home to the wels catfish. Fungi More than 2,400 fungal species have been recorded from Slovenia and, since that figure does not include lichen-forming fungi, the total number of Slovenian fungi already known is undoubtedly much higher. Many more remain to be discovered. Plants Slovenia is the third most-forested country in Europe, with 58.3% of the territory covered by forests. The forests are an important natural resource, and logging is kept to a minimum. In the interior of the country are typical Central European forests, predominantly oak and beech. In the mountains, spruce, fir, and pine are more common. Pine trees grow on the Karst Plateau, although only one-third of the region is covered by pine forest. The lime/linden tree, common in Slovenian forests, is a national symbol. The tree line is at . In the Alps, flowers such as Daphne blagayana, gentians (Gentiana clusii, Gentiana froelichii), Primula auricula, edelweiss (the symbol of Slovene mountaineering), Cypripedium calceolus, Fritillaria meleagris (snake's head fritillary), and Pulsatilla grandis are found. Slovenia harbors many plants of ethnobotanically useful groups. Of 59 known species of ethnobotanical importance, some species such as Aconitum napellus, Cannabis sativa and Taxus baccata are restricted for use as per the Official Gazette of the Republic of Slovenia. Government and politics Slovenia is a parliamentary democracy republic with a multi-party system. The head of state is the president, who is elected by popular vote and has an important integrative role. The president is elected for five years and at maximum for two consecutive terms. The president has a representative role and is the commander-in-chief of the Slovenian armed forces. The executive and administrative authority in Slovenia is held by the Government of Slovenia (), headed by the Prime Minister and the council of ministers