Origins of Hutu, Tutsi and Twa of neighboring people, it was almost non-existent among Rwandan Tutsi. Presence of the sickle cell trait is evidence of survival in the presence of malaria over many centuries, suggesting differing origins. Regional studies of the ability to digest lactose are also supportive. The ability to digest lactose among adults is widespread only among desert-dwelling nomadic groups that have depended upon milk for millennia. Three quarters of the adult Tutsi of Rwanda and Burundi have a high ability to digest lactose, while only 5% of the adults of the neighboring Shi people of eastern Congo can. Among Hutu, one in three
Genocides in central Africa Ituri conflict and the mass murder of Pygmies known as "Effacer le tableau". In Uganda, 300 thousand people were murdered during the regime of Idi Amin and 500 thousand during the rule of his successor, Milton Obote. Amin's genocides targeted the Acholi and Lango peoples; these two groups went on to murder other groups (mainly the Baganda) under Obote's regime. In the early 1970s, over 150 thousand Hutu people were killed by Tutsi people in Burundi by order of General Michel Micombero. Twenty years later, one million Tutsi people were murdered by Hutu people during the 1994 Rwandan genocide. In