The turban shell is a sea snail with a rather nifty trick up its sleeve...er, shell. You see, this snail carries a hard, round, button-like "operculum" with it wherever it goes. What is an operculum, you ask? Why, it is a trapdoor of sorts! When danger approaches, the snail slips into its shell and pulls this trapdoor closed over the opening. Thus it is locked safe and sound inside. And bravo, I say! Bravo! When trouble comes knocking, just do what the turban shell does. Shut the door and turn out the lights!
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