As best the researchers can tell, a single dolphin may have invented the technique relatively recently and taught it to her kin. The simple innovation dramatically changed their behavior, hunting habits and social life, the researchers found. Those that adopted it became loners who spend much more time on the hunt than others and dive more deeply in search of prey. The sponging dolphins teach the technique to all their young, but only the females seem to grasp the idea.altho another article sez the technique confers no advantages. more broadly, i wonder if self-awareness is a necessary condition for tool use?
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