@Finland I don't know if you know, but the natural selection by Darwin says that the strongest species remains alive and the weaker one goes to extinction. So, it could generate new species according to the environment conditions, if I understood right the player can change the environment, and the flora and fauna will be affected by this selection, generating new "random" species.
@SunLion Yeah, my idea was simulate a real nature but 10000x more quickly haha. I don't know, it's very very difficult to do...