Giant African land snails - seen here in 2019 - have been spotted recently in three counties in Florida, spurring state officials to enact quarantines and eradication efforts against the invasive pests. Ismael Francisco/AP. toggle caption Ismael Francisco/AP. Giant African land snails - seen here in 2019 - have been spotted recently in three counties in Florida, spurring state officials to enact quarantines and eradication efforts against the invasive pests. Ismael Francisco/AP. Giant African land snails are back in Florida, spurring intensive efforts to destroy the invasive mollusks before they spread and wreak agricultural and environmental destruction. Giant African land snails contain both male and female reproductive organs, and they don't need a mate to reproduce. Florida has eradicated the highly invasive snail before, according to the USDA. The snail arrived in downtown Miami in 1966, and wasn't declared eradicated until 1975.