Penguin guano in Antarctica could become a missing piece in understanding how natural systems regulate climate.
As odd as it sounds, penguin guano in Antarctica might be helping cool the Earth. New research shows that ammonia from penguin poop helps form low clouds that reflect sunlight and may lower temperatures.
I know it may seem unusual to consider bird droppings affecting the climate. However, the study near Argentina’s Marambio Base proves that this effect is real and surprising. When wind blew from a colony of about 60,000 Adélie penguins, ammonia levels spiked more than 1,000 times normal. Even a month after the penguins left, ammonia remained high in the air.
Here’s why it matters: penguin guano in Antarctica isn’t just waste. When ammonia hits the air, it teams up with sulfur compounds from ocean algae. That combo makes tiny particles that seed clouds. Those low marine clouds cover large parts of the Southern Ocean. More cloud cover means more sunlight gets bounced back into space. That process naturally cools the Earth.
That’s big news in a time when global temperatures keep breaking records. Cloud cover can be messy—if it forms over bright ice instead of dark ocean, it might trap heat instead of reflecting it. But near Antarctica’s waters, the effect may lean toward cooling.
Matthew Boyer of the University of Helsinki led the research. His team used sensitive air instruments in January–March 2023. They waited for winds to blow from a penguin colony 5 miles away. When the wind shifted, ammonia readings jumped to 13.5 parts per billion—huge compared to background levels.
Boyer said that adding penguin guano in Antarctica to the mix speeds up particle formation by 1,000 times, or even 10,000 times. That’s huge, especially in Antarctica, where humans, factories, or forests don’t add many particles to the air. He explained that ammonia doesn’t create the particles but supercharges their formation.
Scientists still need data to confirm whether the effect lasts or how strong it is in the long term. It depends on where the particles travel and what surfaces the resulting clouds hover over. Ice is bright and reflects well. Clouds above ice reflect less, so they might trap heat instead. Boyer says this could make clouds over ice act as a slight warming effect. The team didn’t measure that outcome yet, but it’s important for future studies.
Penguin colonies, some as large as 1 million breeding pairs, produce huge amounts of penguin guano in Antarctica. Overall, Antarctica hosts around 20 million breeding pairs across species. While total annual guano hasn’t been measured exactly, individual colonies can create hundreds of tons. Scientists discovered some new colonies by spotting droppings in satellite images.
Rose Foster-Dyer, a marine and polar ecologist in New Zealand, notes that penguins evolved from flying birds around 60 million years ago. They survived many climate shifts. Adélie penguins build nests on land. Warming could free up new land as ice melts, giving them more breeding areas.
She sees a possible comeback in the Ross Sea region. Old colony sites might reopen with new land. What’s haunting is how fast modern warming is happening—much faster than in natural cycles. Penguins evolve slowly. They may survive in new places, but the rapid pace may hurt food supplies or breeding grounds.
Emperor penguins, the largest species, breed on fast ice. Many studies warn that their habitat is shrinking. But Foster-Dyer believes emperor penguins are more flexible than we give them credit for. They’ve faced change before, and she thinks they may adjust again.
Almost everything in Antarctica seems to be tied back to penguin guano and related wildlife interactions. Droppings fertilize phytoplankton, the tiny ocean plants that produce oxygen and take up carbon. Schools of fish move carbon down into deep water before it settles on the floor. All this shows nature’s surprising role in Earth’s systems.
The researchers focused on summer months near Marambio Base, but the effect lingers. A month after penguins left, ammonia levels were still 100–1,000 times above baseline. Boyer said that even before winter ice sets in, guano continues to release ammonia as it warms.
See also: The Importance of Whale Poop to Maintain Healthy Oceans
I picture the penguins waddling along the coast, unknowingly nudging cloud formations. They’re not trying to change the climate—they’re just doing what penguins do. However, scientists say that these tiny chemical exchanges between guano and algae are significant. In a place with so little else to add particles, penguin guano in Antarctica might help tilt the balance.
For the planet, these findings add another layer of understanding about ecosystems and climate. Even as we reduce carbon emissions, we must also monitor how nature interacts with the atmosphere. Penguins may leave their mark not just in photos, but also in cloud chemistry.
Going forward, researchers aim to track particle formation over ice and water, determine its duration, and model its global effects. However, for now, these findings make a compelling case for looking beyond trees and buildings—simple acts of wildlife conservation matter too.
