Talk:Pink Diamond's Zoo/@comment-27773542-20180121194318/@comment-3225961-20180121231548

The Choosening is an event manipulated by the Zoo caretakers to "encourage" mating. Much like most activities, the Zoomans/Zumans are told to engage in this behavior by a Race of beings from a utilitarian society observing from the outside. Hence, you would expect that the Zumans reproduce only enough times to sustain a population level, rather than to continue to make it grow exponentially. The seemingly sterile environment prevents virtually any pathogenic illness, and the caretakers can probably limit genetic abnormalities/defects that would otherwise hinder survival.

Billions is a very high number, a bit too high, but thousands or even hundreds of thousands isn't unreasonable.