Insectoid Swarms

The unusual black clouds on … are actually dense swarms of large carnivorous insects. These winged predators nest in rock fissures and emerge once daily to devour any scant organic matter available on the planet's surface. Thanks to a potent metabolism which reverses cell decay upon feeding, these arthropods can prolong their lifespan indefinitely, as long as nutrients are consumed regularly.

The command below will trigger the "Insectoid Swarms" event in Stellaris:

When this event fires, you can choose between these 2 options:

• Fascinating.
  Available only if Must not have civic: Devouring Swarm.
  • Add deposit: +3
• Unearth and consume them all.
  Available only if Requires civic: Devouring Swarm.
  • Food: +None to None