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Either that, or something nasty like the Gonchong from the Fighting Fantasy book series Island of the Lizard King.

I would post a link, but the only standalone topic page is on a Fandom site, which counts as doubly morbid.

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Who is the author?
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Greg Egan. It’s in his excellent short story collection “Axiomatic”.
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Why do people think we're going to live forever. We hardly understand anything about the body.
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