Black Hamburgs, White Leghorns, and Sicilian Buttercups were also added to cement its characteristics. Many commercial chickens raised in factories for white eggs are white leghorns. Buff Leghorns were first seen in Denmark in 1885, and in England in 1888. White Leghorns are commonly used as layer chickens in many countries of the world. Cloacas were examined in White Leghorns for a diminutive copulatory organ.