They are apparently a super-breed and their increasing numbers are endangering our native molluscs, according to experts in the field.
I heard about them a while back and just googled ‘Spanish slug’ to find out more. Had a quick look at a Daily Mail article which warned of ‘highly fertile breeds’ that will ‘overrun the country’ and smiled. Illegal immigrants, terrorists, left-wingers, slugs.. so much to worry about.
Here’s a link to a bbc article for a more even-handed approach.