The V'ropak Homeworld

… was the homeworld of the avian V'ropak, a species that was among the founding members of the ancient First League. These flightless bird analogues walked on long, spindly legs and fossilized remains suggest that their females could reach heights of up to four meters, while males were slightly smaller. All of their cities were built inside hollowed out mesas. Scans indicate that some of these mesas were artificially constructed, presumably by the V'ropak themselves after they ran out of natural candidates to build new cities within.

The command below will trigger the "The V'ropak Homeworld" event in Stellaris:

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

• Peculiar.
  • Start special project: V'ropak Homeworld