Giant East African Land Snail

"The East African land snail, or giant African land snail, is a species of large, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Achatinidae.
As they develop rapidly and produce large numbers of offspring, this mollusc is now listed as one of the top 100 invasive species in the world.It is a voracious feeder, and recognized as a serious pest organism affecting agriculture, natural ecosystems, commerce, and also human health. Because of these threats, this snail species has been given top national quarantine significance in the United States. In the past, quarantine officials have been able to successfully intercept and eradicate incipient invasions on the mainland USA."
Ref:http://en.wikipedia.org/wiki/Achatina_fulica