The Border Collie is reputed to be the most intelligent of all sheepdogs. It is used throughout the world for herding animals. Their coats come in many colors, although black and white is by far the most common. Black tricolor (black/tan/white), red and white, and red tricolour (red/tan/white) also occur regularly, with other colors such as blue creme and yellow white, red merle, blue merle, "Australian red"/gold, and sable seen less frequently. Solid Black is also seen.