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Fisiologus was a pen name used by J.R.R. Tolkien, when he published Adventures in Unnatural History and Medieval Metres, being the Freaks of Fisiologus.[1]

The name Fisiologus derives from the work entitled Physiologus, composed by an anonymous author between the second and fourth centuries, which set forth the properties of animals, plants and stones, giving an allegorical interpretation of each in order to illustrate Christian ethical or dogmatic teachings. The Physiologus had wide influence on medieval symbology and the literary genre of bestiaries.