I left it running for a year without a single pawn-creating event naturally triggering. Forcing raids and manhunter packs worked fine. Eventually I force-spawned some caravans and sold off most of the herd, and within a second of the traders stepping off the map, wild animals started spawning again. I wonder if the game treats trainable pets different from animals like cats or chickens?
Cassandra Challenge, btw.
Cassandra Challenge, btw.