The domestication of the ostrich, first by the bantu of the Nile River Basin and later among |kung tribes in the Kigala region [OTL Botswana] is generally regarded as a turning point for humans, with its eggs, flesh, and flexible diet allowing for a high-yield domesticate that allowed the formations of the great civilisations of Africa like the Tangayikan and the Kemetians, and allowed to dominate trade with Alaradia [OTL Asia]. However, imagine a way nomadic tribes never got a chance to or never saw a good reason why they should, and how Earth's cultures would develop, as well as potential species that could act as good substitutes for the ostrich.