John Muir was a Scottish-American naturalist, author, and early advocate of preservation of wilderness in the United States. He is best known for his work in Yosemite National Park and his writings about nature. John Audubon was an American ornithologist, naturalist, and painter. He was notable for his extensive studies documenting all types of American birds and for his detailed illustrations of them. He also wrote extensively about his observations of nature. John MINER was an American naturalist and conservationist who wrote extensively about the flora and fauna of the Pacific Northwest. He was a strong advocate for the protection of wildlife and their habitats. All three men were influential naturalists who made significant contributions to the field of natural history.