Bulls aren't enraged by red — they're red-green colour blind, and it's the movement of the cape that triggers the charge

Bulls aren't enraged by red — they're red-green colour blind, and it's the movement of the cape that triggers the charge

What does a bull actually see when it stares down a matador’s cape? Not the vivid red you and I see. The animal we picture being goaded to fury by a splash of scarlet does not perceive red the way humans with normal colour vision do. It isn’t that red matters a little less than we thought. The bull simply doesn’t see red as the vivid, distinctive colour we do. And the thing it’s actually responding to has little to do with colour. What a bull se…