|Two shells of Only a few species of cephalopods have shells either internal or external that are sometimes found washed up on beaches|
|Very often shells of bivalves or smaller gastropods are used, depending on what is available on the particular where the snail itself lives||Yet the abalone shell is made of the same stuff as the chalk —calcium carbonate|
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|They are not selected or validated||The barnacle goose flies 1500 miles from western Europe to Greenland|
|is a deep water squid-like cephalopod||Most species of xenophorids cement a series of objects to the rim of their shells as they grow|
A with attached seashells Empty molluscan seashells are a sturdy, and usually readily available, "free" resource which is often easily found on beaches, in the , and in the shallow subtidal zone.4