A great many animals have visual senses keyed primarily for movement and are more or less colourblind, simply because the former is far more important for their daily survival (whether for spotting approaching predators or locating prey - hence why many prey animals go stock still when feeling threatened) while colours are of rather little relevance in most ecological niches.
"Gathering omnivores" like us humans and most of our primate relatives, and fruit/berry eaters in general, conversely need pretty good colour vision as telling ripe fruits and berries from raw ones isn't just nutritionally vital - it's critical for avoiding poisonous ones and developement stages...
On another note, adding to the earlier commentary, the red muleta is only used in the final part of a bullfight; pink ones (capote de brega according to Wikipedia) are employed in the multiple build-up stages.
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