What is the sand collar that one often sees on beaches at low tide?
Category:
Science > Zoology
Keywords:
sand collar, beach, low tide, moon snail, naticidae
Type:
what
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Answer:
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.