Hippopotamuses are semi-aquatic megafauna that require substantial water access for skin health, thermoregulation, and behavioral expression. Their welfare in zoos depends critically on pool design and social management.
Hippo welfare in captivity depends fundamentally on continuous access to deep water pools allowing full submersion. Skin conditions including severe drying and cracking develop when water access is restricted. Pool water quality management is demanding as hippos produce large quantities of feces that cause rapid water quality deterioration. Social management is extremely challenging: hippos are aggressive and have caused fatal injuries between individuals and to keepers. The management complexity creates pressure for minimal social groupings that may not meet behavioral needs. Pool depth and dimensions must allow full underwater movement and resting behavior. Modern hippo facilities incorporating underwater viewing panels have shown significant behavioral enrichment value.