The general colour of the old bulls is bluish grey, but younger bulls and cows are browner.
By the famous Golden Bull of 1356 Frankfort was declared the seat of the imperial elections, and it still preserves an official contemporaneous copy of the original document as the most precious of the eight imperial bulls in its possession.
A bath of bulls' blood was much in vogue as a baptism in the mysteries of Attis.
C. antiquorum, are characterized by the large frontal horn of the bulls, the white legs, the network type of coloration and the pale tint.
C. rothschildi also has a large frontal horn and white legs, but the spots in the bulls are very dark and those of the females jagged.