These snails start out really small. If you ever find a long, tan, spiral-shaped casing on the beach, it’s actually an egg casing from a Lightning Whelk. From each individual segment, a number of tiny snails will hatch. The strand can have up to 200 segments, each containing up to 99 snails. They start out not much bigger than a grain of rice and will continue to get bigger and bigger.
The snails begin to grow from the outer edge and continue to grow in a spiral, around and around as it gets bigger. The tip at the top of the shell is the oldest part and the first part formed.
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