Possible Clues:

• Menagerie's conveniences, say, for Africans?
• Bantu-speaking South Africans
• Members of a Bantu people of S Africa
• Members of the largest ethnic group in South Africa
• Victors of the 1879 Battle of Isandlwana
• Last letter from university pertains to Americans and South Africans
• Southern Africa natives
• Bantu speakers
• South African kingdom subjects of the 1800s
• Subjects of Shaka