after xcom rats a new research topic rat breeding program that allows to buy rats for money (you still have to train xcom rats)
Brilliant, why didn't I think of this?
/sarcasm
another solution is the possibility to generate missions for money (low level or deprecated ones) to bring back some rats, arrest some mad men (no one show so far), seek some alien fuel traces (even if for this one there's land survey if you're lucky) to make flare. Or even track down MIB (got only one with a CAWS and no blackops magnum so far)
...what? Missions to necro your rats?
I mean, it's technically doable, but... what?
just put some corn on the ground and wait. rats love corn... XD
Yes, they do!
Or maybe instead of breeding the mutants you're mutating your own. If ratcruitment cost engineer hours and energetic blood, then it would probably be possible to balance.
No, you can't just mutate your own giant rats from normal rats. At least not within timeframes such as in this game.
Conversation at the Biolab:
I will name you Splinter.
Now it's time for martial arts training.
Do we have some turtles somewhere ?
This never gets old, eh?