Actually, it doesn’t.
Bulls, along with all other cattle, are color-blind to red.
Thus, the bull is likely irritated not by the muleta’s color, but by the cape’s movement as the matador whips it around.
In support of this is the fact that a bull charges the matador’s other cape — the larger capote — with equal fury.
Do bulls actually see red?
In fact, they can’t even really see the color red. Bulls, like all other cattle, are colorblind to red. Bullfighters, known as matadors, use a small red cape, called a muleta, during a bullfight. It appears that bulls get irritated by the cape’s movement, not its color.
Why are bulls Afraid of Red?
In the end, the bullfighter kills the bull with a picador (spear) that he stabs between the bull’s neck, through its heart. Many people believe that bulls charge this red cloth because they hate the color red, but the truth is that bulls don’t actually mind the color.
Why do matadors use red?
Bulls are irritated by the movement of the cape. They see the waving fabric and charge, regardless of color. In fact, the muleta is only used in the final 3rd of a bullfight The matador uses it to hide his sword, and he pierces the bull as it charges past. The cape is traditionally red to mask the bloodstains.
Do bulls attack?
Adult bulls may weigh between 500 and 1,000 kg (1,100 and 2,200 lb). Most are capable of aggressive behavior and require careful handling to ensure safety of humans and other animals. The gentle bull, not the vicious one, most often kills or maims his keeper”.