The investigation of the overkill hypothesis in regards to the climate changes that are associated with the extinction of megafauna shows climatic changes had no through effect to forcing the overkill of these large fauna species in North America but rather the geography of human evolution and expansion had the most severity on species life and. The pattern of extinctions corresponds closely with the increasing appearance of humans migrating from the glacial Canada through the ice free corridor. As pointed in a scientific report conducted by Dr Grayson, in the Journal of Anthropology, High extinction despite a relatively stable climateis most striking in South America, forming a strong contrast to sub Saharan Africa where extinction was
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