Analysis of information sources in references of the Wikipedia article "Jenny Haniver" in English language version.
While Gessner was not the first to describe a Jenny Haniver, he was the first to explicitly describe it as a man-made object, and to explain how it was made. His instructions read as follows:
"In order to impress common people, apothecaries and others dry rays and twist their skeletons into all sorts of remarkable poses, making the animal look like a snake or a winged dragon. They twist the body, alter the shape of the head and mouth, and remove other parts or make them smaller. The lower part of the body is cut, and what remains is lifted, to make it look like the creature has wings."