Why do bulls get mad when they see red?
Bulls are colourblind. The idea that red makes them angry comes from the red cape that matadors wave (the colour is traditionally used because it hides the appearance of blood from the audience’s view if the matador is injured). The bull, which is not the most sociable creature anyway, is angry because it is being tormented. You’d be angry too if you had spears sticking out of your neck.
