Alfred Russel Wallace, the father of biogeography, discovered the flora and fauna of the South East Asian islands and the extraordinary way in which they are geographically distinct. In a lively historical narrative, Penny van Oosterzee tells the story of his achievement. His legacy is the Wallace Line, a faunal barrier separating the Asian from the Australian: monkeys from kangaroos, weaver birds from cockatoos, and pheasants from parrots. This invisible...