Most people are not blondes by their genes. Only some people, mostly with European ancestry, are blondes by their genes, and also some Australian Aborigines have a different gene that makes them blonde. Natural blondes are most common around the Baltic Sea and Scandinavia. The Nordic countries such as Sweden, Norway, Denmark, Iceland, and Finland also have many blond people. Ireland and Scotland also have a high number of natural blondes. According to recent genetic analysis, both mtDNA and Y chromosome exist in Austrians. There is also a large number of blondes in England, Baltic countries, Slavic countries (especially Poland), north-western parts of Russia and among European descent that have lived in Kazakhstan since the Soviet Union. Natural blondes are also common in Canada, United States, Australia, New Zealand, Argentina, Chile, The Netherlands, United Kingdom, and Germany. Light hair can also brought on by environmental factors, especially exposure to sunlight.