Okay
I always think of this forum as being essentially Space, but good general science is certainly
okay by me, too.
And as for two humanoid species living together - not that there's anything wriong with that!
To make this kinda space, if multiple species of intelligent beings can appear over the same
time periods on the same planet, it gives me hope that it might be happening on other worlds,
too. This would naturally increase the odds that at least one intelligent race will come out
of existence alive and then expand into space.