“Bulls are enraged by the color red”

The long-standing image of a bull charging furiously at a matador's vibrant red cape has ingrained in popular culture the idea that these powerful animals are enraged by the color red. This dramatic scene, often depicted in movies and cartoons, has led many to believe that red is a universal trigger for bovine aggression. However, this common misconception stems from a misunderstanding of bull vision and the traditions of bullfighting.

Scientifically, bulls are not enraged by the color red because they are largely colorblind to it. Like many other hoofed animals, bulls possess dichromatic vision, meaning their eyes have two types of cone cells, allowing them to see blues and yellows but making it difficult to distinguish between red and green. To a bull, the matador's bright crimson cape likely appears as a dull brownish-gray or yellowish hue. Their aggressive reactions are actually provoked by the rapid, sudden movements of the cape, which they perceive as a threat, not by its specific color. Experiments have shown that bulls will charge at any moving object, regardless of its color.

The use of a red cape, known as a muleta, in bullfighting is primarily a matter of tradition and practicality, rather than a tactic to incite the bull. The red color serves a crucial purpose: it helps to mask bloodstains that inevitably occur during the bullfight, making the spectacle less gruesome for the audience. The myth persists largely due to the strong visual association created by bullfighting and its widespread representation in media, reinforcing the mistaken belief that red is an infuriating color for these animals.