Stranger dropped a bag of Cheetos in America's largest caves, disrupting an entire ecosystem. It attracted fungi, flies and insects; Staff ended up preserving cave's formation

What appears to be a forgotten bag of Cheetos isn’t much litter, but in one of America’s biggest caves, it kicked off an unexpected chain reaction. The snack attracted mould, microbes and insects, changing the environment around it and showing how even a tiny mistake can affect a delicate ecosystem. That was summer 2023 at Carlsbad Caverns National Park, New Mexico. When park staff found the abandoned bag, its contents had begun to affect the cave's surroundings.

How did a bag of Cheetos change the ecosystem?

Carlsbad Caverns is known for its enormous underground chambers and striking rock formations. Its Big Room is one of the largest cave chambers in North America, with delicate formations that have developed over long periods. But caves are also home to small organisms that depend on limited sources of food. When a visitor left a bag of Cheetos behind, the processed corn snack introduced an unusual nutrient source into the environment.

In a Facebook post explaining the incident, the National Park Service said: “The processed corn, softened by the humidity of the cave, formed the perfect environment to host microbial life and fungi.” The damp snack soon attracted mould and other organisms. Insects, including cave crickets, mites, spiders and flies, gathered around the food, creating a temporary food web that would not normally form in the same way.


According to The Washington Post, the added nutrients also allowed mould to spread onto nearby cave surfaces. What appeared to be an ordinary snack spill had become an unexpected disturbance to the underground environment.

Why a small snack can cause a big problem

Caves are very different from the world outside. They receive little or no sunlight, and food can be difficult to find. Organisms living there have adapted to these conditions, making sudden changes in their food supply significant. Andy Baker, a professor of biological, earth and environmental sciences at the University of New South Wales Sydney, explained the risk to The Washington Post: “The critters that live in caves have adapted to that environment.” He added that introducing food could disturb the existing balance.

The problem is not limited to Cheetos. Food waste can bring outside nutrients and organisms into places where they do not naturally belong. This can change which species gather in an area and how nutrients move through the ecosystem. The incident was also a reminder of why trash in the natural environment can be detrimental to more than just visitors.

How the staff cleaned up the Cheetos

Park staff removed the discarded snack and carefully cleaned the affected area. According to the National Park Service, rangers spent about 20 minutes removing the food and mould from the cave surfaces. The cleanup required care because the cave's natural formations can be damaged by rough handling. Rangers used a toothbrush to remove mould from some of the nearby surfaces. Although the litter was removed, the incident had already provided a lesson about how quickly outside materials can affect the cave.

In its statement, the National Park Service described the impact this way: “At the scale of human perspective, a spilt snack bag may seem trivial, but to the life of the cave it can be world-changing.” Carlsbad Caverns welcomes thousands of visitors, but the park has strict rules about food inside the caves. Visitors are generally not allowed to bring food beyond the designated underground lunchroom, apart from clean drinking water. The Cheetos incident is a reminder that protecting nature does not always require a major action. Sometimes, it begins with something as simple as taking rubbish back out of a park.