Hippopotamuses in zoos face welfare challenges unique to their semi-aquatic lifestyle and complex social needs. Enrichment programs must address their aquatic, foraging, and social behavioral repertoire.
Hippopotamus welfare in captivity is often visually deceptive: a hippo lying motionless in a pool may appear content when actually experiencing thermoregulatory stress from insufficient water depth or abnormally high water temperatures. The welfare needs of hippos are demanding because they require both aquatic and terrestrial areas of sufficient size, complex social management, and constant water access. Traditional zoo hippo exhibits with small pools and limited land area fail to meet these needs and produce animals with behavioral restriction, dental disease, and chronic stress. Modern hippo management best practice involves deep, temperature-controlled pools, complex terrestrial terrain with browse opportunities, and appropriately managed social groups.