Why Do Bulls Get Angry When They See Red?

Bulls don't really get angry when they see red, because they can't see red! Bulls are colorblind, and see everything in shades of black, gray, and white.

Then, why does a bull attack a waving red cape? It attacks the cape because of its waving motion, not its color.

To a bull, a green cape would probably look the same as a red one.

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