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Four hundred miles off the Chilean coast, the Juan Fernandez Islands are the home of many plants and animals found nowhere else in the world. They are also the source of Daniel Defoe's Robinson Crusoe story. Paul Evans visits the archipelago in search of the endemic Juan Fernandez firecrown hummingbird and discovers that introduced plants and animals, such as cats, goats and even blackberries, are causing severe problems for the uniquely-adapted willdife of the islands.