The Migir-Yan Homeworld

The diminutive but fast-breeding Migir-Yan were one of the founding members of the ancient First League, and … was their homeworld. The population was clustered into hundreds of massive arcologies spread out across the surface, each capable of supporting several hundred million individuals. These arcologies were connected by a network of skyways, and the Migir-Yan were evidently content to leave the rest of the …'s wilderness untouched.

The command below will trigger the "The Migir-Yan Homeworld" event in Stellaris:

When this event fires, you can choose between the following option:

• Fascinating.
  • Start special project: Migir-Yan Homeworld