Spanish slugs: Public urged to report sightings
19 October 2013 Last updated at 11:34 BST
Scientists are asking people to report sightings of Spanish slugs, to see how much of a threat they are to Britain.
The Spanish slug is much larger, and more resistant to slug pellets than species native to the UK.
Tristan Maclean, a scientist from the John Innes Centre in Norwich, explains how they differ from ordinary slugs.