Yes, for example, black hair is the darkest and the most common of all hair colors, because of the massive populations with this dominant genetic trait. It is usually found in people of all backgrounds and ethnicities. Brown hair is mainly seen among populations in the Western world, especially among those from Central Europe, Southeastern Europe, Eastern Europe, Southern Europe, Southern Cone, the United States, and also some populations in the Greater Middle East where it transitions smoothly into black hair. Red hair is the least common hair color in the world, as people with red hair represent only 1–2% of the population. Red hair is mainly associated with Celtic nations. It is found in the British Isles, Scotland, which has the highest number of redhead, and in the northern and western fringes of Europe; as it is mainly found in the United Kingdom. Blonde hair is a very rare color in human beings, as blond hair people are only found in Europe and Oceania.