Alexander von Humboldt, German naturalist, c1830. Humboldt's (1769-1859) interests included geophysics, geology and botany and he is sometimes called the founder of ecology. He is shown here at the time of his expedition in South America (1800-1804) when, with the French botanist Aime Bonpland (1773-1858), he explored the Orinoco and Amazon regions and collected 60,000 plant specimens.
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