Oyster
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An oyster that is open when you first find it is quite possibly dead.
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The oyster shuts itself inside when pressure is applied. If you want to eat it you’ll have to work your way through the muscles.
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If the oyster refuses to open up, you can simply boil it to its opening.
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If it still doesn’t open, then it’s spoiled. Don’t eat it.
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Oysters make the water around them cleaner by filtering it.
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Some oysters are not to be eaten; they contain gems they have created around a tiny irritant.
And you are the world’s oyster, after all.

That’s quite brilliant
Merci