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Despite living in a supposedly less varied environment than ours, I'm starting to think that dolphins' language is richer and more detailed than ours, after reading this. Kinda like Egyptian pictographs, but motion 3d video broadcast right into your brain in real time, 'steada carved in rock. i wonder just how detailed thier mental sonograms are. I bet they rawk and rawk hard.
The tie-in to SETI at the end really makes me think...what would an announcement signal look like to our radio telescopes that comes from a dolphinlike ET that has no need or concept of symbolic language? Their idea of what constitutes an "obvious" announcement signal might be so different from ours that despite our shared assumptions about things like the 21cm band, monochromatic broadcasts etc, that we could pick something up that sounds just like static but is in fact the encyclopedia galactica we've been looking for. Crikey maybe they find monochromatic broadcasts far too limiting.