Agressive NPC doesn't spawn on my custom planet

I wonder what do I do wrong.

I've created planet and set one monster spawning everyware in hight density. If I use animals like Triceratops, Slimes, or unagressive bugs they spawns properly but when I change them to something Agressive like Overseers or Spiders then they do not spawn on the planet

This works:

CreatureSpawning:
- Biomes: [Grassland,Forest, DeepForest, Marsh,Savanna, SavannaEdge,Swamp, WaterSwamp, Beach,DustBowl,Tundra, ColdPlains,Sand,PolarSnow]
Entities:
- Name: Triceratopses
Period: Always
Amount: 1500
DelayMinMax: [10,12]
Color: "1, 0.5, 0"

And this doesn't:

CreatureSpawning:
- Biomes: [Grassland,Forest, DeepForest, Marsh,Savanna, SavannaEdge,Swamp, WaterSwamp, Beach,DustBowl,Tundra, ColdPlains,Sand,PolarSnow]
Entities:
- Name: Spiders01
Period: Always
Amount: 1500
DelayMinMax: [10,12]
Color: "1, 0.5, 0"

Do you have any ideas what to do to spawn those bad guys?

 

Are you waiting a couple in-game days after landing on the planet? Hostile critters don't spawn until the second night if I remember correctly.

I don't believe there's any way to modify that timer either.

 

Yes. That was the case.

Thank you very much!

 

You're welcome!