Spanish slug

Arion vulgaris

The Spanish slug, also known by its scientific name ''Arion vulgaris'', more commonly known in English-speaking countries under the incorrectly applied Latin name ''Arion lusitanicus'', is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae, the roundback slugs.

They can lay up to 400 eggs a year.

This is a highly invasive slug species. It is often considered a pest, not only in areas where it has been accidentally introduced, but even in places where it is indigenous.