squatrackcurls

The premised of "Wealthy societies have fewer children." is wrong; correlation != causation.

You're posing these things as though they're axiomatic for all beings; as if these beings (which don't exist) would operate exactly as we do and not have their own cultures and ways of being distinct from our own here (of which are vastly different amongst people of other countries on Earth). It's a very narrow, human-centric view.

We haven't found any because they don't exist outside of science fiction.