Hippopotamuses have complex social and environmental needs that make captive management challenging. Water access and social grouping are particularly critical welfare factors.
Hippopotamuses are among the most water-dependent large mammals, making adequate pool provision a fundamental welfare requirement. Insufficient water access causes skin cracking and thermal stress. Social management is complex because hippos are aggressive and territorial — inappropriate grouping can lead to serious injury and death. Best practice zoo hippo management provides large, deep pools, access to terrestrial areas for grazing and overnight rest, and carefully managed social groups. Behavioural monitoring informs social management decisions. Some zoos have significantly improved hippo welfare through pool redesign, provision of diverse substrates, and enrichment programs that encourage natural foraging and exploratory behaviour.