…they can even use stones to raise the water level in a tube to get at a floating worm, thus possibly proving one of Aesop’s fables to be, well, not a fable, but a fact!
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The history of this story, in ancient and medieval natural history, literature, and theology, is explored in Chapter One of a little book I wrote (yikes, I’ve been digitized!):
http://ia301512.us.archive.org/3/items/hielertunsdermei00wriguoft/hielertunsdermei00wriguoft.pdf
All the texts are translated in an appendix.
This article got picked up by a lot of papers(including the Middletown NY Herald), and was even a bullet on Yahoo news.