Just this week a horde of really, really big snails made the news by slowly taking over Florida. Here are some other awesomely oversize species that have infiltrated regions around the globe (but mostly in Florida).
Snails on Steroids
Organism: Giant East African Land Snail, Achatina fulica
When: 1966-1976, 2011-now
Snails the size of rats are slowly invading Florida. The sluggish, oversized army of giant African land snails is poised to scar parts of Miami-Dade county with a comprehensive slimed-Earth strategy, a campaign that involves eating practically everything in sight -- whether plant, tire, or stucco -- and coating the county in disease-causing goo.
It's not the first time these snails of unusual size have waged a glacial assault on this invasion-prone state.