PhysOrg Posted August 2, 2018 Share Posted August 2, 2018 When the young naturalist Alfred R. Wallace left England to explore the New World in 1848, one of his key observations in the Amazon region was that large rivers were unsurpassable barriers for some species of animals, particularly primates and birds. Even more interesting, he noticed that closely related species often occupied forests on opposite sides of a river, but they were never found together. View the full article Link to comment Share on other sites More sharing options...
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