![If a black swan is found, then the theory that all swans are white is disproved. What if the theory is that there is a black swan out there, and it is If a black swan is found, then the theory that all swans are white is disproved. What if the theory is that there is a black swan out there, and it is](https://qph.cf2.quoracdn.net/main-qimg-23ac393830ed372d4d05b34cfe83da2c.webp)
If a black swan is found, then the theory that all swans are white is disproved. What if the theory is that there is a black swan out there, and it is
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![Black swan, Cygnus atratus, and wild greylag goose, Anser anser. Handcoloured copperplate stipple engraving from Dumont de Sainte-Croix's "Dictionary of Natural Science: Ornithology," Paris, France, 1816-1830. Illustration by J. G. Pretre, engraved Black swan, Cygnus atratus, and wild greylag goose, Anser anser. Handcoloured copperplate stipple engraving from Dumont de Sainte-Croix's "Dictionary of Natural Science: Ornithology," Paris, France, 1816-1830. Illustration by J. G. Pretre, engraved](https://c8.alamy.com/comp/2A7HHE4/black-swan-cygnus-atratus-and-wild-greylag-goose-anser-anser-handcoloured-copperplate-stipple-engraving-from-dumont-de-sainte-croixs-dictionary-of-natural-science-ornithology-paris-france-1816-1830-illustration-by-j-g-pretre-engraved-by-massard-directed-by-pierre-jean-francois-turpin-and-published-by-fg-levrault-jean-gabriel-pretre-17801845-was-painter-of-natural-history-at-empress-josephines-zoo-and-later-became-artist-to-the-museum-of-natural-history-turpin-1775-1840-is-considered-one-of-the-greatest-french-botanical-illustrators-of-the-19th-century-2A7HHE4.jpg)