Professor Wagner followed in the footsteps of Dr. Heinrich Landois, who famously wrote a comprehensive scholarly study on the voices and sounds of animals.
Professor Wagner followed in the footsteps of this scholar until he ultimately overtook him with an excellent book of his own, Acrididae: Grasshoppers and their Sound Mechanics, for which he selected a quotation from Aristotle’s History of Animals as an epigraph: “Ai akrides tois pedaliois pribousai poiosi ton psochon” (Locusts produce a sound by rubbing themselves with their legs).
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