![]() ![]() On these islands, Darwin observed species of organisms on different islands that were clearly similar, yet had distinct differences. Darwin’s journey, like Wallace’s later journeys to the Malay Archipelago, included stops at several island chains, the last being the Galápagos Islands west of Ecuador. ![]() Wallace traveled to Brazil to collect insects in the Amazon rainforest from 1848 to 1852 and to the Malay Archipelago from 1854 to 1862. Beagle, including stops in South America, Australia, and the southern tip of Africa. From 1831 to 1836, Darwin traveled around the world on H.M.S. Importantly, each naturalist spent time exploring the natural world on expeditions to the tropics. ![]() In the mid-nineteenth century, the actual mechanism for evolution was independently conceived of and described by two naturalists: Charles Darwin and Alfred Russel Wallace. He postulated that the beak of an ancestral species had adapted over time to equip the finches to acquire different food sources. Darwin observed that beak shape varies among finch species. ![]()
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