Ghana’s giant tiger snail. According to the inquiry data, the world's largest snail is not only edible, but also kept as a pet, and is expensive at more than 100 US dollars. The Ghanaian giant tiger snail is the largest land snail in the world. The adult shell is generally 18 cm long and 9 cm wide, and the largest shell in the wild is 30 cm x 15 cm. This is a popular species. Due to its size and lack of availability, they are more difficult to breed than other African snails. Like all gastropods, these snails are hermaphroditic, with each snail giving birth to an average of 1,200 eggs per year. An egg.