They don't. They don't even see red, they are partially colorblind. It's the movement of the material of "the cape" in bullfighting that they see and go towards.

They aren't. Bulls can't actually see the color red. They have a form of color blindness that doesn't let them see that color. They get aggressive toward the waving and flapping motions of the cape and yelling. But the cape could be any color. Red is chosen because you don't see the blood of the bull. They get angrier and angrier in bull fights because the matador is actually stabbing them with a sword when the bull runs by them.

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As others have said even though the bulls don't see red it's also red because it's a lot easier and more exciting for the crowd to see than other colors (like beige) edit clarity

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They don't. The TV show Mythbusters disproved this back in the day. Cattle, like most mammals other than primates, are red-green colorblind.

The movement of the cape is what makes the bull attack, not the color. Red is just the traditional color of the cape because it hides bloodstains; pink and yellow are also common.

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