(February 12, 1809 - April 19, 1882)
Charles Robert Darwin was an English naturalist. He established that all species of life have descended over time from common ancestry, and proposed the scientific theory that this branching pattern of evolution resulted from a process that he called natural selection.
John James Audubon
(April 26, 1785 - January 27, 1851)
John James Audubon (Jean-Jacques Audubon) 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 their natural habitats. His major work, a color-plate book entitled The Birds of North America
(1827–1839), is considered one of the finest ornithological works ever completed. Audubon identified 25 new species and a number of new sub-species.