First of all, Eurasia, thanks to its wide area and ecological diversity, has more candidates. Second, Australia and the Americas, not Eurasia or Africa, lost most of their candidates in the wave of mass extinctions by the end of the Pleitene era - possibly because of Australia's mammal species and The Americas, unfortunately, were the first species to encounter humans unexpectedly at a later stage in human evolutionary history, when our hunting skills were highly developed. Finally, in Eurasia, the percentage of surviving candidate species that appears to be suitable for domestication is higher than in other continents.
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