Indeed. Humans and not other apes reached the moon by our great proclivity to long distance running, through our exceptional sweat glands... ah, wait. How is it possible to live in the world around us and not see, apparent and transparent, that intelligence is the lever on which everything rests? Humans are surprisingly weird animals, but it's not our hairlessness or our fairly average propensity to violence that did…
Meanwhile, consider the termite. Their society has been stable for millions of years and they've colonized the earth. Intelligence is not needed for that.