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HalMorris comments on You can't signal to rubes - Less Wrong
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This isn't an explanation until it can explain why peahens prefer peacocks with bigger tails. That's what the signalling hypothesis is for. I don't see why these are considered competing hypotheses.
Do you suppose a cat's hiss tells another cat something about strength and fitness via lung-power?
That could explain their fear of vacuum cleaners and blow-driers.
I don't suppose that, and I assume you don't expect me to suppose that, but I don't know what you're trying to tell me.
Sorry, should have made that an independent comment, not really an answer to anything in this thread. Just a pet theory brought to mind by all this talk of peacocks and signalling. Cats threaten each other with a toneless sound of rushing air, and and are afraid of high-powered mechanical devices that produce a version of the same effect.