...A pen shell! This one is around seven inches. These are mollusks related to mussels, and they live in soft, sandy mud. They don't dig or burrow in the mud, they grab their food.They anchor themselves by using their small "foot" to excrete out sturdy thin "byssus" threads. Byssus threads are what mussels and such use to anchor themselves as well. These threads are so sturdy that the romans spun them into clothing! Would you like to go around wearing a mollusk's excretion? Ew. :S
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