'Killer' Slugs Advance on Sweden

The question is now whether the slug is here to stay in the north or whether the find was an exceptional event.

"The 'killer' slug won't survive a normal winter. But if climate changes make the winters mild then there is naturally a risk that it survives and makes itself at home," said Ted von Proschwitz.

The Spanish 'killer' slug, or Arion lusitanicus as it is formally known, is a species foreign to traditional Swedish fauna.

The slug is a regular topic of discussion for Sweden's gardeners each spring and the opposition Social Democrats have even called for a national strategy to defeat the scourge.