The welfare requirements of common hippopotamuses in captivity, including their aquatic needs, social complexity, and thermoregulation.
Hippopotamus welfare in captivity centers on providing adequate aquatic habitat — both in depth and in quality. Hippos who cannot fully submerge, who have limited pool space for natural swimming behavior, or whose water quality is inadequate develop skin conditions, behavioral stereotypies, and chronic stress. Beyond the aquatic environment, social management is critical: hippos are social animals that need compatible companions, but male-male conflict can be fatal, requiring facilities to manage group composition carefully. Their large size and high caloric needs create management challenges that smaller, lower-resourced facilities struggle to meet, and hippos in inadequate facilities often show obesity, skin problems, and stereotypic behavior.