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    Georges Cuvier, French Naturalist  
Georges Cuvier was a renowned French naturalist and zoologist considered the founder of comparative anatomy and vertebrate paleontology. He originated a system of zoological classification that comprised four phyla based on differences in s...
 
    Alexander von Humboldt, Naturalist  
Alexander von Humboldt was a German naturalist and explorer, and the younger brother of the Prussian minister, philosopher, and linguist, Wilhelm von Humboldt (1767-1835). Humboldt's quantitative work on botanical geography was foundational...
 
    Saint-Hilaire, Naturalist  
Étienne Geoffroy Saint-Hilaire was a French naturalist who established the principle of "unity of composition". He was a colleague of Jean-Baptiste Lamarck and expanded and defended Lamarck's evolutionary theories. Geoffroy's scientific vie...
 
    Robert Brown, British Botanist  
Robert Brown, Scottish botanist and botanical explorer. In 1801 he went as a naturalist on one of Matthew Flinders's expeditions to Australia, returning (1805) to England with valuable collections. In his Prodromus florae Novae Hollandiae e...
 
    John James Audubon, Birds of America  
John James Audubon (Jean-Jacques) was a French American ornithologist, naturalist, and painter. He was notable for his expansive studies to document all types of American birds and for his detailed illustrations that depicted the birds in t...
 
    Philipp F. von Siebold, Japanese flora and fauna  
Philipp Franz Balthasar von Siebold was a German physician, botanist, and traveler. He taught some pupils Western medicine in Japan. He achieved prominence for his study of Japanese flora and fauna, and was the father of female Japanese doc...
 
    Charles Darwin, Evolution Theory - 1859  
Charles Robert Darwin was an English naturalist who realised and presented compelling evidence that all species of life have evolved over time from common ancestors, through the process he called natural selection. The fact that evolution o...
 
    Edward Blyth, Zoologist  
Edward Blyth was an English zoologist and pharmacist. He was one of the founders of zoology in India. Blyth was born in London in 1810. In 1841 he travelled to India to become the curator of the museum of the Royal Asiatic Society of Bengal...
 
    Joseph Dalton Hooker, Botanists  
Sir Joseph Dalton Hooker was one of the greatest British botanists and explorers of the 19th century. Hooker was a founder of geographical botany, and Charles Darwin's closest friend. He was Director of the Royal Botanical Gardens, Kew, for...
 
    Samuel Baker, Discovery Lake Albert  
Sir Samuel White Baker was a British explorer, officer, naturalist, big game hunter, engineer, writer and abolitionist. He also held the titles of Pasha and Major-General in the Ottoman Empire and Egypt. He served as the Governor-General of...
 
    Gregor Mendel, Father of Genetics  
Gregor Johann Mendel was a Austrian priest and scientist, and is often called the father of genetics for his study of the inheritance of traits in pea plants. Mendel showed that the inheritance of traits follows particular laws, which were...
 
    Alfred Russel Wallace, Evolution through Natural Selection  
Alfred Russel Wallace was a British naturalist, explorer, geographer, anthropologist, and biologist. He is best known for independently conceiving the theory of evolution through natural selection; his paper on the subject was jointly publi...
 
    Henry Walter Bates, Naturalist  
Henry Walter Bates was an English naturalist and explorer who gave the first scientific account of mimicry in animals. He was most famous for his expedition to the rainforests of the Amazon with Alfred Russel Wallace, starting in 1848. Wall...
 
    Thomas Henry Huxley  
Thomas Henry Huxley was one of the first adherents to Darwin's theory of evolution by natural selection, and did more than anyone else to advance its acceptance among scientists and the public alike. As is evident from the letter quoted abo...
 
    Hayden, Founding of Yellowstone National Park  
Dr. Ferdinand Vandeveer Hayden was an American geologist noted for his pioneering surveying expeditions of the Rocky Mountains in the late 19th century. He was also a physician who served with the Union Army during the Civil War. In 1871...
 
       
 
         
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