 proposed an alternative theory that "Bos" in general and "B. primigenius" in particular arose in Africa.Following the 2009 discovery of the remains an African species of "Bos" in Eritrea, "B. buiaensis", which also immigrated into the Levant, this theory gained currency based on morphological and chronological grounds.Conversely, the presence of "B. primigenius" remains in the Levant which pre-date the earliest remains of both "B. buiaensis" and "B. namadicus", as presented by Ofer Bar-Yosef and Miriam Belmaker in 2011, cast doubt upon this 'out-of-Africa' theory as well as the theory that aurochs developed from "B. namadicus".