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> The prevailing theory is that ratio of brain mass to body mass is more telling than the absolute size

A bit weird nitpicking when you yourself make an insubstantial claim about some "prevailing" theory. I think we can both agree that reducing meat consumption is the right thing to do, it's just sometimes to convince people you need to show some leeway.

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Why don't you go check it out yourself?

https://en.wikipedia.org/wiki/Brain-to-body_mass_ratio

https://en.wikipedia.org/wiki/Encephalization_quotient

check what? You posted some links that explain a metric which was theorized to measure intelligence. That wasn't what I requested source for (it's a theory). I asked for a source that says this theory is the prevalent theory.

Btw I never made any comment about fish's brain size, I said they're generally less intelligent than farm animals, which wikipedia agrees with, fits the brain ratio theory too: https://en.wikipedia.org/wiki/Fish_intelligence#Brain

Thanks for derailing the conversation anyway, at the end, there is no such thing as a fish

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