“Livestock adopted in Africa were Eurasian species that came in from the north. Africa's long axis, like that of the Americas, is north/south rather than east/west. Those Eurasian domestic mammals spread southward very slowly in Africa, because they had to adapt to different climate zones and different animal diseases.” LongDifferentAnimalDiseaseWestSouthClimateSpeciesSpreadEastZoneAdoptedMammalsAxesLivestockNorth AfricaDifferent Animals Author:Jared Diamond