A collection of giant African land snails in Miami. The Giant African Snail eats buildings, destroys crops and can cause meningitis in humans. But some people still want to collect, and even eat, the slimy invaders. The Department of Agriculture is trying to stop them. Since June, USDA has seized more than 1,200 of the large snails, also known as Giant African Land Snails, all of them traced back to one person in Georgia who was illegally selling them.