Uniqueness Is Rare

If some other technological species ever evolved on earth before us, would it have endured long enough to leave any evidence of its passing in the fossil record? We might not see it directly if it had corpse destruction rituals, but we might see remains of its artificially selected domesticated animals. It might even be still here, but not recognisable to us as earth-life because it took control of its own evolution.

~ Roedy (1948-02-04 age:70)