Simplify the following text for a Grade 4 native English-speaking person.
Original: One species of land snail , the Giant African Snail , can grow to be 15 i from snout to tail , and weigh 1 k. The largest living species of sea snail is Syrinx aruanus which has a shell that can measure up to 90 c in length , and the whole animal with the shell can weigh up to 18 k.
Simplified: The biggest snail is the giant African snail .