"Look for them! Report them!" implores the poster about this "major landscape and agricultural pest" that "can grow up to 8 inches in length" and has "no natural enemies." Well, perhaps one enemy, if you allow for acquired tastes.
"Wanted: Giant African Snail"
Fairchild Tropical Botanic Garden
10901 Old Cutler Rd., Coral Gables, Florida
(From an autumn 2012 visit)