The deadliest game animal in Africa is the Hippo, they drown their victims.
http://en.wikipedia.org/wiki/UgandaHowever, much of the south is poorly drained, while the centre is dominated by Lake Kyoga, which is also surrounded by extensive marshy areas. Uganda lies almost completely within the Nile basin. The Victoria Nile drains from the lake into Lake Kyoga and thence into Lake Albert on the Congolese border. It then runs northwards into South Sudan. One small area on the eastern edge of Uganda is drained by the Turkwel River, part of the internal drainage basin of Lake Turkana.
http://en.wikipedia.org/wiki/HippopotamusHippos are still found in the rivers and lakes of Uganda, Sudan, Somalia, Kenya, northern Democratic Republic of the Congo and Ethiopia, west through Ghana to Gambia, and also in Southern Africa (Botswana, Republic of South Africa, Zimbabwe, Zambia). A separate population exists in Tanzania and Mozambique.