Hippopotamuses are semi-aquatic megafauna with complex social and environmental requirements. Meeting their welfare needs in captivity requires extensive water features, appropriate social groupings, and management of their significant aggression potential.
Hippo welfare centres on water access above all else. Without adequate deep water, hippos develop severe skin problems, thermoregulatory stress, and behavioural frustration. Pool design must allow full submersion, allow wallowing and social interaction, and provide sufficient depth for the animals to remain submerged with minimal effort. Social management is complex — compatible groupings require careful assessment because hippo aggression is severe and injuries can be fatal. Feeding must account for their nocturnal grazing pattern; providing bulk grass ad libitum during appropriate hours supports natural behaviour. Positive reinforcement training for routine care — voluntary weigh-ins, examination of feet and skin — reduces stress during health monitoring.