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[Demonic Gophers]

(This post was inspired by the thread suggesting that goblins and elves be infertile to keep them from swamping everyone else with sheer numbers in long-history worlds, but I think it's separate enough to belong in its own thread instead of trying to derail that one.)

It would probably be useful to have a token defining a creature's fertility level, providing more control over reproductive rates.  This could be FERTILITY:PERCENT, or FERTILITY:MIN:MAX to allow some variation between individuals.  Any time the game is deciding if a creature will reproduce, it would multiply the potential parents' fertility rates to determine the chance.  This would make it easy to give very long-lived species a lower reproductive rate, and species that are supposed to be very prolific could have FERTILITY:100 to guarantee that they reproduce at every possible opportunity.  It could determine population growth rate in world gen, and also the chance for a couple to conceive in fortress mode.

When hybrids are added, this could be expanded to FERTILITY:CREATURE:CASTE:PERCENT, so mixed-species couples can be less fertile than normal.  Or more fertile, for that matter - maybe mortal half-elves become more common than ageless pure-blood elves when human and elven populations mix long enough.


A token to set the duration of pregnancy could also help fine tune population growth rates, and might help to differentiate livestock options a bit more.

[Azerty]

It is a better option than sterile Elves and Goblins.

[IndigoFenix]

Also, the STERILE syndrome token could be replaced with an effect that decreases (or increases, for blessings from fertility gods) the unit's fertility.

[voliol]

+1

[darkhog]

Good idea. This would also allow modders adjust fertility levels of fast breeding animals (cats come to mind) so that you won't need to remember to geld males or slaughter them to avoid FPS death.