Ethiopia’s Omo Valley | Africa’s Last Frontier, National Geographic Magazine: Drinking Cow’s Blood in Ethiopia’s Omo River Valley

Cow blood and milk, and sorghum, keep these people alive. Nyangatom (Bume) are pastoralists who keep their livestock in boma-like, thorn-fenced areas.  They shoot the cows with an arrow and then collect the blood, which is their major source of protein.  They sometimes mix the blood with milk.