Nuttall, Thomas, 1786–1859, American naturalist, b. England. He was a pioneer in American paleontology and was curator (1822–32) of the Harvard botanical garden. He accompanied several scientific expeditions to the Mississippi and Missouri valleys and the Pacific coast and published his findings in The Genera of North American Plants (2 vol., 1818) and A Manual of the Ornithology of the United States and of Canada (1832). In 1842 he returned to England. He also wrote an account of his travels (1819) into the Arkansas territory.