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1848 - Wallace in South America & Malay
A red butterfly During his eight years in the Malay region, Wallace covered around 14,000 mile and amassed 125,000 specimens. He is a perfect example of the Victorian collecting naturalist, who made their career and reputation from detailed field studies. As well as contributing to the general understanding of the region, Wallace's studies led to him formulating the theory of biogeography.
 
A green butterfly He drew an imaginary line between islands in the "Malay Archipelago", indicating a natural separation between Asian and Australian species. He believed that as the life forms of these areas were so distinct, they must have arisen separately. Today, his original line has been moved, but it is named the 'Wallace line' in his honour.

1687 - Sloane in Jamaica 1831 - Darwin in South America 1848 - Wallace in South America & Malay 1872 - Challenger & the deep ocean