Pando has been speaking all along. Researchers have simply learned to listen.
Pando is the world's largest living organism by mass, spanning 40 hectares with 47,000 stems interconnected by a single root system. Hydrophone recordings reveal vibrations from foliage, branches, and roots, potentially confirming Pando's interconnected root network and water movement patterns.
- Pando weighs 6,000 tons and spans 40 hectares with 47,000 interconnected stems
- Researchers used a hydrophone in 2022 to record vibrations from leaves, branches, and roots
- A storm recording revealed deep, resonant sounds from the organism's core
- Friends of Pando nonprofit organization led the acoustic research project
Researchers used hydrophone technology to record acoustic vibrations from Pando, a 6,000-ton aspen clone in Utah, capturing sounds from leaves, branches, and root systems during various conditions including storms.
In 2022, researchers lowered a hydrophone into the soil around Pando, a male quaking aspen in Utah, and listened. What they heard was the sound of the world's largest living organism by mass speaking in its own language—the creaking of 47,000 interconnected stems, the whisper of leaves in wind, the deep rumble of water moving through roots that stretch across 40 hectares and weigh 6,000 tons combined.
Pando is not a single tree in the way most people understand trees. It is a clone, a single genetic individual that has reproduced asexually for thousands of years, sending up new stems from a shared root system that binds the entire organism together underground. The name itself comes from the Latin for "I spread," which is precisely what Pando has done—spreading across an area roughly the size of 56 football fields, its pale bark and trembling leaves creating a visual unity that belies the acoustic complexity researchers were about to discover.
The hydrophone, a device typically used to record underwater sound, proved equally sensitive to vibrations traveling through soil and wood. Friends of Pando, a nonprofit organization dedicated to studying and preserving the organism, installed the equipment and captured acoustic data that revealed the constant hum of a living system at work. The recordings picked up the movement of leaves and branches, the structural creaks of the massive stem network, and crucially, the vibrations generated by water flowing through the root system—a phenomenon that had never been directly documented before.
One recording captured during a storm revealed something unexpected: a deep, resonant sound emanating from Pando itself, a bass note that seemed to come from the organism's core. This was not the sound of wind alone, but of the entire structure responding to atmospheric pressure and moisture, a kind of biological conversation between the organism and its environment.
Lance Oditt, one of the founders of Friends of Pando, explained that these acoustic recordings could help confirm what researchers have long suspected—that Pando's root system is genuinely interconnected, functioning as a unified whole rather than as separate trees sharing space. But the implications extend far beyond simple confirmation. The data could illuminate how water moves through the organism, how the canopy and root system communicate, how insect colonies interact with the structure, and how deep the roots actually penetrate into Utah's soil. These are questions that have remained largely unanswered because the tools to investigate them did not exist.
Jeff Rice, the researcher who installed the hydrophone, emphasized that the acoustic data serves a purpose beyond scientific curiosity. The sounds of nature, he noted, are a record of environmental health. They document biodiversity, capture the baseline conditions of an ecosystem, and create a reference point against which future changes can be measured. As climate patterns shift and ecosystems respond, Pando's acoustic signature could become a crucial indicator of how the organism—and the landscape around it—is adapting or struggling.
The recordings are beautiful, certainly. But they are also practical. In an era when environmental change is often invisible until it becomes catastrophic, the ability to listen to an organism and hear its health status offers a new kind of early warning system. Pando has been speaking all along. Researchers have simply learned to listen.
Notable Quotes
The sounds of nature can be used to document the health of an environment and provide a baseline for comparing environmental changes— Jeff Rice, hydrophone researcher
The acoustic data could help confirm Pando's interconnected root system and illuminate how water moves through the organism— Lance Oditt, founder of Friends of Pando
The Hearth Conversation Another angle on the story
Why use a hydrophone specifically? Isn't that tool designed for water?
It is, but sound travels through any medium—water, soil, wood. The hydrophone is just sensitive enough to pick up vibrations that would be invisible to human ears. In Pando's case, it captured the movement of water through roots, the flex of stems, the tremor of leaves. All of that is acoustic information.
What does a storm sound like coming from inside a tree?
Deep. Resonant. Not like wind noise—more like the organism itself is responding to pressure changes, to moisture in the air. It's the whole system vibrating together, 47,000 stems moving as one.
Can these recordings actually prove the root system is connected?
Not yet. That's what researchers hope future studies will show. But the acoustic data is suggestive. If the roots weren't interconnected, you'd expect to hear isolated signals. Instead, the vibrations seem to travel through the entire organism.
How does listening to a tree help us understand environmental change?
Sound is a record. If you know what Pando sounds like now—the frequency of water movement, the resonance of the canopy, the insect activity—you have a baseline. In ten years, if those sounds change, you know something has shifted. It's an early warning system.
Is Pando dying?
Not that we know. But it faces pressures—drought, insects, climate shifts. Having an acoustic record means we can detect problems before they become visible.