WellBecause it was in an ad with other leghorn varieties
If you know you know
Here is an excerpt of a Spanish description of Catalanas that was lost in the translation to English
Large or very large hanging chins, thin and well rounded from below; long neck, thin, erect, with abundant slavery to the back; stretched trunk, cylindrical, but vigorous; slender, straight and elongated chest; long back, of medium width, and inclined from the shoulders to the tail in a straight line with an angle of 40 º with the horizontal