Still, a few people have declared it's at least possible that intelligent natives are at large in the wilderness.

Granted, there were intelligent natives here, but their civilization was only in its beginning stages.

And Down has intelligent natives, too.

You can't exploit a world with intelligent natives. . . But conscience may've had nothing to do with it.

Yet I was told that many hardy, intelligent natives were inveterate Whistlers.

It wasn't an unpleasant world at all, really; it was too bad there were no intelligent natives around with whom one might do a little trading.

A few have intelligent natives to study.

Venusian - Four-legged intelligent native of Venus, with three eyes and a largely unintelligible speech.

If a usable planet had intelligent natives, these were either exterminated or enslaved.

And most of those that exist have intelligent natives; a good many of the rest have already been colonized by others.