As the Beagle's two-year itinerary stretched into five years, Darwin found ample opportunity to note the constant change in the variety of creatures he observed, particularly among the unique animals of the GalÃÂ¡pagos: marine iguanas and land-dwelling iguanas; giant tortoises with shells exhibiting a diverse range of shapes and patterns; and more than 20 species of finches, each with a distinctive beak. Although obviously related to each other, many species appeared to have developed adaptations that made them better suited to their particular environment.
Upon his return home in 1836, Darwin published a series of books based on the notebooks and diaries from his voyage, including this historic work Ã¢ÂÂ essential reading for scientists, historians, and anyone with an interest in the natural world.
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