Conrad Gessner (also Konrad Gesner, Conrad Geßner, Conrad von Gesner, Conradus Gesnerus, Conrad Gesner; 26 March 1516 – 13 December 1565) was a Swiss naturalist and bibliographer. He was well known as a botanist, physician and classical linguist. His five-volume Historiae animalium (1551–1558) is considered the beginning of modern zoology, and the flowering plant genus Gesneria and its family Gesneriaceae are named after him. A genus of moths is also named Gesneria after him. He is denoted by the author abbreviation Gesner when citing a botanical name. ...Gessner's great zoological work, Historiae animalium, is a 4,500-page encyclopedia of animals that appeared in Zürich in 4 volumes between 1551 and 1558: quadrupeds, amphibians, birds, and fishes. A fifth folio on snakes was issued in 1587. A German translation of the first 4 volumes titled Thierbuch was published in Zürich in 1563. This book was considered to be the first modern zoological work. It built a bridge between ancient, medieval and modern science. In Historiae animalium Gessner combines data from old sources, such as the Old Testament, Aristotle, Pliny, folklore, and medieval bestiaries, adding his own observations. He created a new, comprehensive description of the Animal Kingdom. This was the first attempt by anyone to describe many animals accurately. The book unlike many works of its time was illustrated with hand-colored woodcuts drawn from personal observations by Gessner and his colleagues. Gessner was the first to describe the brown rat and the guinea pig in Europe. Even though he sought to distinguish observed facts from myths and popular errors and was known for his accurate depiction of many animals in Historiae animalium, he also included many fictional animals such as the Unicorn and the Basilisk, which he had only heard about from medieval bestiaries. But when Gessner doubted the accuracy of the opinions he relayed in his own writings, or the validity of the illustration... [Wikipedia] undefined

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