Sudden Black Bugs on Ceiling + Green Caterpillar in Lamp: Likely Unrelated

Group of 12 tiny black insects on ceiling appear by evening; green caterpillar (pinkie-length) found in lampshade, vanishes when approached. Homeowner thinks they're breeding fast.

Expert Take

Almost certainly two separate incidents. Caterpillar likely wandered in from outside (or houseplant). Black bugs could be:

• Fungus gnats (from houseplant soil)
• Drain flies (from sink/tub drains)
• Moth flies
• Escaped beneficial insects

Next Steps

• Photo of black bugs needed for ID.
• Check houseplants—fungus gnats emerge from wet soil.
• Check drains—clean with brush + enzyme cleaner.
• Caterpillar: capture and release outside if found again.

No evidence of rapid breeding infestation. Stay calm, investigate sources.