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[[File:HMS Beagle by Conrad Martens.jpg|thumb|left|alt=On a sea inlet surrounded by steep hills, with high snow-covered mountains in the distance, someone standing in an open canoe waves at a square-rigged sailing ship, seen from the front|As [[HMS Beagle|HMS ''Beagle'']] surveyed the coasts of South America, Darwin theorised about geology and extinction of giant mammals.]]

[[文件:HMS Beagle by Conrad Martens.jpg|缩略图|左|当比猎犬号调查南美洲海岸时，达尔文提出了关于地质学和巨型哺乳动物灭绝的理论。]]