If you have killer slugs in your garden it can be a significant problem that has to be dealt with in some way. To get a clearer picture of the problem I’ve put together a list that shows where they have spread to. If you’re fighting killer slugs (Arion Lusitanicus) in your area please leave place and year in the comments and I’ll update the list:

1975 Sweden
1990 Finland
1991 Denmark, Lemvig
1998 US, New York, Ithacha

Norway
Falkland Islands

The most northern observation: 2005 Oulu, Finland