Zoo Animals

Zoo Hippopotamus Thermoregulation Welfare

Hippopotamuses regulate body temperature through water immersion and require continuous access to sufficient depth water for welfare.

Key Facts

Hippos lack sweat glands and overheat rapidly without water access
They secrete a red fluid ('blood sweat') providing sun protection and antimicrobial functions
Minimum water depth must allow full submersion and buoyancy for true thermoregulatory benefit
Hippos spend the day in water emerging at night to graze - a cycle that must be respected in zoo management

Welfare Considerations

Hippos denied adequate water depth cannot thermoregulate effectively, causing heat stress and skin problems. The welfare minimum is deep water allowing full submersion at all times. This simple but space-intensive requirement is frequently inadequately met in older zoo facilities.

What You Can Do

Support zoos with deep-water hippo facilities allowing full submersion
Advocate for minimum water depth standards in hippo welfare requirements
Learn about hippo conservation in sub-Saharan Africa