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Animalia Paradoxa is the label given to a few species of animal, listed in Carolus Linnaeus early editions of Systema Naturae. Linné thought that these animals did not make sense. Today, such animals are usually called Cryptids. The respective section lists fantastic creatures found in medieval bestiaries as well as those reported by explorers from abroad and gives explanations to why they are excluded from Systema Naturae. According to Swedish historian Gunnar Broberg, it was to offer a natural explanation and demystify the world of superstition. Paradoxa was dropped from Linnaeus' classification system as of the 6th edition (1748).
Included in the 1st (1735) edition:
- Hydra: in 1735 Linnaeus inspected the alleged remains of a Hydra in Hamburg which turned out to be made from weasels and snake skins.
- Rana-Piscis: a South American frog which is significantly smaller than its tadpole stage; it was thus (incorrectly) reported to Linnaeus that the metamorphosis in this species went from 'frog to fish'. In the 10th edition of Systema Naturae, Linnaeus named the species Rana paradoxa, though its genus name was changed in 1830 to Pseudis.
- Monoceros is in reality Monodon.
- Pelecanus: "Linnaeus thought [pelicans] might reflect the over-fervent imaginations of New World explorers"
- Satyrus: Linnaeus wrote "with a tail, hairy, bearded, with a manlike body, gesticulating much, very fallacious, is a species of monkey, if ever one has been seen."
- Borometz (aka Scythian Lamb) "Linnaeus [...] had seen a faked vegetable lamb taken from China to Sweden by a traveler"
- Bernicla (aka Scottish Goose) Frederick Edward Hulme noted: "[The] barnacle-goose tree was a great article of faith with our ancestors in the Middle Ages."
- Draco: Linnaeus wrote that it has a "snakelike body, two feet, two wings, like a bat, which is a Lacerta alata or a ray artificially shaped as a monster and dried."
- Automa Mortis Linnaeus wrote "The DEATH-WATCH produces the sound of a smaller clock in walls, is named Pediculus pulsatorius, which perforates wood and lives in it".
Four taxa were added in the 2nd (1740) edition:
- Blunt, Wilfrid (1983). Linnaeus, the man and his work. Berkeley and Los Angeles: University of California Press. pp. 176–177. . https://books.google.com/?id=B3YOvgAACAAJ.
- Sandra Knapp (2002). "Fact and fantasy". Nature 415 (6871): 479. . Also available on Scribd.
- S. W. Garman (1877). "Pseudis, the paradoxical frog". The American Naturalist 11 (10): 587–591. https://archive.org/stream/americannatural04instgoog#page/n591/mode/2up.
- Andy Dobson, Kevin D. Lafferty, Armand M. Kuris, Ryan F. Hechinger & Walter Jetz (2008). "Homage to Linnaeus: How many parasites? How many hosts?" (PDF). Proceedings of the National Academy of Sciences 105 (Suppl. 1): 11482–11489. . . . http://www.lifesci.ucsb.edu/eemb/labs/kuris/pubs/Dobson%20et%20al.2008-PNAS-homage%20to%20Linnaeus.pdf.
- Carl Linnaeus, Systema naturae (1735; facsimile of the first edition), trans. M. S. J. Engel-Ledeboer and H. Engel (Nieuwkoop, Netherlands: B. de Graaf, 1964), 30. via 
- Bondeson, Jan (1999). "Spontaneous generation". The Feejee Mermaid and Other Essays in Natural and Unnatural History. Cornell University Press. pp. 193–249. . https://books.google.com/?id=zsQAc_QlB5cC&pg=PA212.
- Hulme, Frederick Edward (1886). Myth-land. S. Low, Marston, Searle & Rivington. https://books.google.com/?id=qrBZAAAAMAAJ.
- Linne, Carl von (1740). Systema naturae in quo naturae regna tria: secundum classes, ordines, genera, species, systematice proponuntur. Apud G. Kiesewetter. p. 66. https://books.google.com/?id=oXsZAAAAYAAJ&pg=PA66.