[Zerox]

Indeed.
I see your point about natives dying out...but many labour eggs have been stolen/kidnapped/rescued, and the queen is constantly laying new eggs.
20 years is plenty of time, though, surely?
Some natives may be from escaped Mudokons. I presume a fair few do escape, to either become natives or live in the cities, as has been said. Remember all those Mudokon corpses hanging on spikes in the stockyards of AO? I reckon a few did manage to escape. And there's far more factories to escape from than jsut Rupturefarms.
And finally, I have always presumed there's more than on Mudokon Queen. There's millions of bee and ant queens in Britain alone, each with a colony. Slightly less Mud queens, sure, but still a fair fiew. One queen alone doesn't seem a whole lot for a single species.

I estimate a healthy Mudokon queens life to be around 80-100 years. Maybe longer. Whales live longer, and Sam is pretty goddamn hefty, as well as being one of the more 'intelligent[/i] life forms (humans live longer than cats and dogs, etc.).