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So you have this very simple creature, an ant, using grooming to regulate levels of excitement. But we also know humans, cats, birds, many much larger animals do the same thing. Did the first bilaterian do this? Or is it just a natural consequence of the bilaterian nervous system?

I'm not saying that ants are going "breathe, Myrmecia,... count to ten, get ahold of yourself." ... but I do think that there is some common thread there.