Zardnaar
Legend
So, I don't see how, "restricting their numbers to a sustainable level" is consistent with "cannot feed themselves except by expanding into humanoid lands". If they need to expand, their current situation is, by definition, not sustainable.
Explained it earlier. Human adventurers/explorers/settlers have gone into their lands and liked some.
The Queens have laid more eggs that have hatched with more hatching soon.
So diplomatically asking the Queens not to expand means they starve.
Whatever the humanoid races are they don't have the resources to feed them either.
From the Queens PoV the humanoids are the resources after the humanoids provoked them and killed their workers.
The incident happened a year or so ago and they've ramped up egg laying in the intervening time.