A study looked at how a type of worm-like creature, called Phasmarhabditis hermaphrodita, affects young slug pests. They fed adult garden slugs and young Spanish slugs these worms for four days. The worms made the slugs eat less, and they didn't kill the Spanish slugs as well as the garden slugs. The smallest Spanish slugs were affected the most, eating nearly 90% less food. The worms were very good at killing adult garden slugs, with almost all dying. But, for the Spanish slugs, only 47% of the smallest ones died at the end of the experiment. It shows that these worms can help control young Spanish slugs by stopping them from eating instead of killing them.