Hippos and Their Natural Sunscreen: Nature’s Built-In SPF
They may look like lazy river giants, but hippos are full of surprises — and one of the weirdest is their ability to sweat sunscreen. That’s right: these heavyweights of the water come with their own built-in sunblock. Let’s explore the strange science behind hippo sweat and what makes it one of nature’s coolest survival tricks.
What Is Hippo Sunscreen?
Hippos secrete a reddish-orange oily substance from their skin, often called “blood sweat.” Despite the nickname, it’s not actually blood or sweat. It’s a special secretion that acts as a natural sunblock, skin moisturizer, and even an antibiotic!
This unique goo coats their skin and gives them a slightly shiny, pinkish tint in the sun — making it look like they’ve been doused in something out of a horror movie.
Why Do Hippos Need Sun Protection?
Unlike elephants or rhinos, hippos have very sensitive skin. When they leave the water — especially during dry season — they can easily get sunburnt. Their natural sunscreen keeps their skin hydrated and protected from harsh UV rays.
Since they spend much of the day lounging in rivers and lakes, the oily secretion also prevents skin infections from bacteria lurking in the water.
Hippos Don’t Sweat Like We Do
Humans sweat to cool down, but hippos can’t regulate body temperature the same way. That’s why they stay submerged during the hottest part of the day. Their natural sunscreen helps keep their skin safe while they’re sunbathing on land or cooling off in shallow water.
Interestingly, their oily sweat also has antimicrobial properties — meaning it helps fight off skin infections and wounds from fighting or scraping rocks.
What Scientists Discovered About Hippo Sweat
Researchers studying the secretion found two key pigments: one red and one orange. Both absorb UV light and inhibit bacterial growth. These pigments are rare in the animal kingdom — and found only in hippos.
Scientists are even exploring whether this could inspire new types of human sunscreen in the future!
More Than Just River Grumps
While hippos are often seen lounging and yawning in slow motion, they’re also one of Africa’s most unpredictable animals. Despite their bulk, they can run surprisingly fast and are fiercely territorial in water.
But behind their grumpy reputation lies an amazing adaptation that keeps their massive bodies healthy and sun-safe in the scorching African heat.