Artificial Nests Help African Penguins Beat the Heat

African penguins didn’t have a homelessness problem and were happily laying their eggs in burrows dug into centuries-old layers of their excrement until the 1800s when traders discovered that African penguin guano was an excellent fertilizer and shipped it to the United Kingdom.

The guano burrows had provided African penguins with these benefits.

 • A constant micro-climate
• High relative humidity
• Buffered temperatures
• Little exposure to the wind
• Shelter from rain and predation

Why Are African Penguins Endangered?

If you’ve ever imagined life as an African penguin, lounging on the beaches of Algoa Bay, South Africa, it might seem idyllic—until you peek behind the curtain of history. Since the turn of the 20th century, African penguin populations have plummeted by a staggering 98%, dropping from roughly three million birds to a mere 48,000 today. Not exactly the kind of dramatic transformation you’d choose for your family album.

So, what happened to send these dapper seabirds from thriving to barely surviving?

A Perfect Storm of Human Meddling

It all starts with guano—penguin poo, in less glamorous terms. For centuries, penguins happily constructed cozy burrows in thick layers of guano, which created the perfect hideaway for raising chicks. But the 1800s brought an unexpected twist: guano was discovered to be gardening gold. Traders descended, scooping up mountains of it and shipping it off to fertilize European crops. Suddenly, penguins found themselves out in the open, left to nest on bare ground, exposed to the relentless African sun and nosy predators.

Worse still, African penguins are built to conserve heat in icy waters, not shed it on land. Without insulating burrows, they’re prone to overheating—picture tuxedoed sit-ups under a midday sun, not elegant.

More Than a Housing Crisis

Predators and heat weren’t their only new troubles. Overfishing entered the scene, making it ever harder for penguins to find their favorite snacks: anchovies and sardines. With their food sources dwindling and their chicks left unprotected while adults try to cool off in the sea, survival rates have crashed.

Today, key breeding colonies across the South African coastline are fighting an uphill battle. Conservationists are advocating for stricter fishing regulations and urgent habitat protection, but the birds still face the one-two punch of climate change and historical habitat loss.

With their nesting sites effectively stolen, penguins were left to nest in the open, making them vulnerable to heatstroke and their chicks and eggs exposed to heat damage and predators.

Luckily, some brilliant people discovered a way to create artificial penguin nests, or penguin penthouses, to protect African penguin families. The nest team spent three months rigorously field-testing 15 different nest prototypes, each equipped with high-precision sensors, determining the microclimate conditions inside the various test nests.

Keeping Things Cool: Inside the Penguin Penthouses

So how do these ceramic penthouses actually perform when it comes to temperature and humidity? Turns out, they’re a game-changer. The interior of the nests consistently stays a couple of degrees cooler than the penguins themselves, whose resting body temperature hovers just under 100°F (or 37.6°C for metric fans). This makes the nests a refreshing refuge during sweltering days.

Humidity-wise, things also stay comfortably high—over 70%—which helps both eggs and chicks thrive. Even when the weather outside is deceptively mild, the difference is dramatic. Picture this: on a sunny 25°C (77°F) afternoon, the ground right outside the ceramic nest sizzles at a blistering 51°C (124°F), while inside the nest it’s a pleasant 23°C (73°F). That’s almost a South African spa day for penguins.

Most importantly, if adult penguins have to leave the nest temporarily, the eggs stay safe from overheating—a leap forward in penguin parenting peace of mind.

Continued environmental monitoring proved that the new design met all the environmental requirements, with the ultimate test passed when African penguins successfully bred and raised their chicks in these newly designed penthouses.

Why Conservation Matters for African penguins

Finding smart ways to help African penguins isn’t just a nice idea—it’s absolutely necessary if we want these tuxedoed beach-goers to stick around for future generations. Overfishing has dramatically reduced their main food sources, like anchovies and sardines, leaving penguins searching further and harder for a decent meal. Conservation groups have been urging the South African government to set up fishing-free zones near key breeding colonies, hoping that with fewer nets in the water, penguins would stand a chance at bouncing back.

But the dinner menu isn’t their only challenge. Even if we solve the fish shortage, African penguins are still left fighting off rising heat and hungry predators with almost no natural shelter left, thanks to all that historic guano mining. Without practical solutions—like safe, shady nesting spots—even the best efforts at sea won’t be enough to tip the scales. Protecting their homes on land is just as important as restoring their dinner table in the ocean.

Tackling Overfishing and Land-Based Dangers

Of course, cozy real estate isn’t the only answer to African penguins’ woes. Conservationists are also zeroing in on another massive problem: the dwindling buffet of anchovies and sardines in the surrounding seas. To give penguin parents a fighting chance, scientists are urging the South African government to temporarily ban commercial fishing near six major breeding colonies, allowing fish populations—and hungry chicks—a chance to bounce back.

However, it’s clear that even a well-stocked dinner table won’t save the species if penguins continue baking in the sun and dodging predators at every turn. That’s where these new ceramic ‘burrows’ come in—offering sanctuary from heatwaves and marauding gulls, while broader protections at sea help secure the snack supply. It’s a tag-team effort: restoring safe nesting spaces and restoring food security, both critical to tipping the scales back in the penguins’ favor.