Hippopotamuses are semi-aquatic giants that spend most of their time submerged. Zoo welfare depends critically on deep water pools, appropriate social management, and space to express territorial behavior safely.
Hippo welfare in zoos centers on the adequacy of water provision. Without deep pools for full submersion, hippos cannot thermoregulate, cannot express their primary behavioral motivations, and develop skin conditions from solar exposure. Social management of hippo groups requires careful attention to male territorial aggression — fatalities and severe injuries occur in groups with inadequate space. Providing separate feeding stations reduces feeding competition. Hippos are highly intelligent and benefit from feeding enrichment that requires problem-solving. Night access to grazing areas, where feasible, supports natural behavioral repertoires suppressed by daytime exhibit requirements.