So it just occurred to me, I got to this weird line of thinking when considering some of the creatures in the caves. Deathclaws, for instance, are capable of breeding and produce eggs.

While I doubt that many of the creatures on the bestiary are able to reproduce in such a way, I was wondering if it would be possible for creatures like deathclaws. That way, say, characters can venture into the tunnels and find nesting grounds and vicious Mama and Papa Walking Meat Grinders. It could also create a threat of certain creatures multiplying over time.

(Also supposedly deathclaw eggs can make a really good omelette and souffle. Just sayin'.)