FactSentinel

Verdict: False.

Bulls are not enraged by the color red. In bullfighting, the red cape is a tradition and a visual signal for the audience, but the bull's reaction is driven mainly by movement, threat, stress, and the handling context. A moving cloth of another color can also provoke a charge.

Cattle have dichromatic color vision. They can distinguish some colors, but they do not experience the red-green range the way most humans do. The bright red fabric is much more important to the spectacle than to the animal's decision to charge.

The accurate statement is that bulls can respond aggressively to motion, confinement, pain, or perceived threat. Red fabric by itself is not a special trigger.

Sources reviewed:
American Museum of Natural History, animal color vision overview: https://www.amnh.org/
Encyclopaedia Britannica, bullfighting: https://www.britannica.com/sports/bullfighting
Live Science explainer on the red-cape myth: https://www.livescience.com/33700-bulls-charge-red.html