Sometimes you want to determine a random species for whatever reason. The first column uses a d66 to select a species at random oblivious to the demographics of the galaxy as if whaloids and fungaloids were as common as humans. The second column uses a d666 to select a species at random taking into consideration the varying population sizes of the known species of the galaxy.

Note: this too is arbitrary as it relates more to the prevalence of spacefaring beings rather than sheer numbers. There are probably oceans with trillions of sentient shrimplings somewhere that might outnumber the humans but the humans get all the attention because they travel the stars (and most of my players are human).