The ability to take pleasure in one's life is a skill and is a kind of intelligence. So intelligence is a hard thing to evaluate and it manifests itself in so many different ways. I do think the ability to know how to live a life and not be miserable is a sign of that.
But our society does not grant nontraditional forms of intelligence equal recognition no matter how much it would help us get along or truly enrich our lives.
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Human folk are as a matter of fact eager to find intelligence in animals.