Hippopotamuses face significant threats in the wild from habitat loss and bushmeat hunting, and zoo populations play a genuine conservation role when welfare standards are met.
The conservation justification for keeping hippos in zoos is stronger than for many species - they face genuine extinction pressure, zoo populations provide genetic insurance, and public engagement with zoo hippos generates conservation funding and awareness. However, the conservation justification does not override the welfare obligation: zoo hippos must have access to appropriate deep water, appropriate social groupings, and species-specific husbandry. Conservation goals and welfare goals must both be met.