Ninety-five percent of Albania's people are ethnic Albanian, and Albanian is the official language. Religions include Muslim (Sunni and Bektashi), Albanian Orthodox, and Roman Catholic. Scholars believe the Albanian people are descended from a non-Slavic, non-Turkic group of tribes known as Illyrians, who arrived in the Balkans around 2000 BC. Modern Albanians still distinguish between Ghegs (northern tribes) and Tosks (southern tribes).