This group of Thoroughbreds from the Haras des Étincelles in Mesnil-Simon in the Calvados department allows comparing the coat colors of the breed. The bay color of the horse on the left is the most common. Predominantly brown, it includes black at the level of the mane, the tail, and the extremities of the limbs. Such characteristics differentiate it from the chestnut color, also brown, of the young middle horse. The gray coat of the last horse concerns only 3% of Thoroughbreds. It is said to be descended from two or three stallions - Alcock's Arabian, Brownlow Turk, and D'Arcy's White Turk - believed to be responsible for the presence of the graying gene within the breed. Gray Thoroughbreds, wrongly reputed to be slower, were once excluded from racetracks.