What is the sand collar that one often sees on beaches at low tide?

beaches collar low Sand sees tide
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What is the sand collar that one often sees on beaches at low tide?

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A sand collar is the egg case made by moon snails, of the family Naticidae. The eggs are laid in a gelatin-like matrix with which sand grains are mixed. The individual egg capsules can be seen under a magnifying glass or microscope. When the little snails hatch, they swim around for a while before settling on the bottom.

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