The Giant African Land Snail is the largest among all land snails in the world. The common name actually refers to three giant species in the family Achatinidae: Achatina achatina, Archachatina marginata and Lissachatina fulica.
The largest snail, which is recorded till the present, when fully extended, measured 1 feet and 3.5 inches (39.3 cm), with a shell length of 10.75 inches (27.3 cm).
They can live up to 10 years
Here is a video that you can see the lifecycle of an Giant African Land Snail