Actually, I'd argue in many ways, primates and ceteceans show a remarkable amount of restraint and other "human" characteristics. I'm not that well versed on the latest in developmental intelligence studies, but I do know that toothed whales in particular have shown remarkable reasoning powers and human-like emotional responses. It wouldn't surprise me in the least to learn that their intelligence is on par with ours, just that they don't have the same social constructs that we do (now that really is a hypothesis, I don't believer there's any hard data indicating toothed whales have human-level intelligence.... YET).
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