 The so-called "modern foundational bloodlines" are Saltillo, Murube, Parladé and Santa Coloma, all of which are mainly composed of Vistahermosa blood.Cattle have dichromatic vision, rendering them red-green colorblind and falsifying the idea that the color red makes them angry; they just respond to the movements of the "muleta".The red coloring is traditional and is believed to both dissimulate blood stains and provide a suitable light-dark contrast against the arena floor.