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The
Speciation and Biogeography of Birds by Ian Newton. Why do we rely on this text? Quoted from the Preface:
"This book is concerned mainly with the process of species formation in
birds, and with the factors that affect their geographical ranges. The current distributions of
species depend not just on prevailing conditions, but also on past conditions which have enabled
species to reach the areas they have or eliminated them from areas formerly occupied."
This map is of utmost importance to birders and Ornithologists because the physical features of any
region, and the accessibility of other regions, can greatly affect the
evolution of species, making the species in Southern China, for example, south of the Himalayas, vastly
different from their northern counterparts just over the mountains in the Palearctic region.
This map groups delineates the regions by the geographic boundaries and therefore, by the
differences the birds display from one region to another.
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