where do they come from

[Hydraa]

There is also a line in the setting file where I think you can make the colonization module itself turn into people.

Automatic Colonization Population := 0

And I think if you have any pop onboard it will not do the auto transfer of pop for you. If the cargo is empty though it will fill the colony ship to capacity upto leaving 1 behind on the planet. I do this quite often when using a low reproduction race so when I colonize a outlying world I can colonize more than one from there