Recent investigations into butterfly releases across Finland have unveiled a troubling discovery: several of the butterflies transported for environmental and educational purposes were unwitting hosts to parasitic wasps. These tiny invaders, often invisible to the naked eye, were found living inside the butterfly larvae, using the host as a breeding ground before emerging as parasites. This finding raises concerns about the unintended ecological impact such releases might have, especially in sensitive or protected habitats where the balance of local species is already vulnerable.

The study highlights several key points about the parasitic wasps found:

  • Species Variety: Multiple species of parasitic wasps were identified, some previously undocumented in the region.
  • Infestation Rates: Up to 35% of released butterflies carried wasp larvae internally.
  • Potential Risks: The spread of these wasps could threaten native insect populations by disrupting existing predator-prey…