Hippos are among the most dangerous and least-studied large African mammals. Habitat loss, poaching, and territorial conflict cause significant welfare harms to populations outside protected areas.
Hippopotamus welfare is threatened by territorial crowding as water bodies shrink through drought and diversion, habitat loss that reduces grazing range, and poaching. Territorial fights between males cause severe tusk wounds that can be fatal or cause prolonged injury without treatment. Hippos forced to travel longer distances to find grazing are exposed to road traffic and human conflict. As water bodies shrink in drought conditions, multiple pods are forced into smaller areas, dramatically increasing the frequency and severity of territorial conflicts and associated injuries. Poaching for ivory-substitute teeth causes acute welfare harms. Human-hippo conflict in agricultural areas leads to retaliatory killings. Conservation requires maintaining adequate water body sizes and grazing corridors.