Hi. I use the planet mod Pelagos and was quite surprised to see a copper spitter spawner from that planet suddenly arrive on my Nauvis island base (installed the mod midway through a 300 hour playthrough, Pelagos already visited, some copper spitters still alive on the Pelagos map very far from the center) through a migration event, along with a biter spawner. I assume this isn't intended behavior? As an aside, it happened on an unexpected location, there's no biter nests facing that side of my base for thousands of tiles. There are closer ones in another direction, though. Can they appear on the opposite coast to where they're coming from? Hmm. That might not have been a bug, and they simply accumulated enough budget to make the jump from far away. Regardless, this is on default mod settings, Nauvis generation settings changed so it's a lot of small-medium sized islands, and no other mods that affect or add enemies other than Maraxsis. Evolution factor on Nauvis is 0,9838, Pelagos is 0,7812.