Which Genus Homo species is thought to have first migrated out of Africa?

The reason Homo ergaster is considered the first species to have migrated out of Africa is due to its significant anatomical adaptations that made it well-suited for life outside of the African continent. Homo ergaster exhibited features such as a larger brain size compared to earlier hominins, a more modern body structure with long limbs and a relatively smaller face, and a more efficient bipedal locomotion.

These traits suggest that Homo ergaster was capable of surviving in diverse environments, which likely facilitated its movement beyond Africa. Fossil evidence shows that populations of Homo ergaster reached parts of Asia and Europe, indicating that this species was among the first to leave its African origins.

In contrast, other species listed, such as Homo naledi, Homo floresiensis, and Homo habilis, are either not believed to have migrated or did not have the anatomical features that support long-distance travel and adaptation to varying environments outside of Africa.