For the first time, researchers have documented nematode worms assembling into tower-like structures in nature. The towers were found on fallen apples and pears in orchards near Konstanz, Germany, and their coordinated responses suggest they can function as collective transport structures—not merely as piles formed by competing worms.
What the worms were doing
The worms gathered into upright, tower-like formations on rotting orchard fruit. When a tower was touched or otherwise stimulated, it responded immediately: the structure grew toward the stimulus and attached to it. That active, directional behavior is why researchers describe the formation as a moving “superorganism,” rather than a passive aggregation.
Daniela Perez, a postdoctoral researcher at the Max Planck Institute of Animal Behavior and first author of the report, summarized the interpretation: “A nematode tower is not just a pile of worms. It’s a coordinated structure, a superorganism in motion.” She also said, “The towers are actively sensing and growing.”
Where the wild towers were found
The observations were made on fallen apples and pears in orchards near Konstanz, Germany. A June 6, 2025 report associated the work with researchers at the Max Planck Institute of Animal Behavior and the University of Konstanz. These are the first reported observations of nematode towers in the wild; similar structures had previously been seen in laboratory experiments.
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The available report does not establish how often the towers occur, how many worms make up a typical tower, how tall they become, or how widespread the behavior is beyond the observed orchards.
Which worms take part?
The reported participants were nematodes in the dauer larval stage. Dauer is a specialized, stress-resistant developmental stage that allows certain nematodes to survive unfavorable conditions and disperse. The observation therefore should not be generalized to every life stage or every nematode species.
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In laboratory work described in the report, researchers used the model roundworm Caenorhabditis elegans. The evidence supports the possibility that collective tower-building is a broader movement strategy among some worms, but it does not show that all nematodes build towers.
Why scientists interpret the towers as cooperation
A crowded mass could form for several reasons, including competition, escape, or simple physical contact. The towers’ stimulus-directed growth provides evidence for something more organized. Perez said, “When we touched them, they responded immediately, growing toward the stimulus and attaching to it.”
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This behavior is consistent with cooperative mass transit: individual worms contribute to a structure that can reach a surface or object beyond the group. The report does not prove that every worm benefits equally, nor does it rule out competition within the group. It does show that the structure is responsive and coordinated rather than inert.
How the laboratory experiment reproduced the behavior
Researchers placed C. elegans on an agar plate and provided a toothbrush bristle as a scaffold. A tower formed within two hours. That timing is the only specific duration reported for the work; no numerical worm count, tower height, transport-speed improvement, or field frequency is provided.
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- Model worms: The experiment used C. elegans, a standard laboratory roundworm.
- Surface: The worms were placed on an agar plate.
- Scaffold: A toothbrush bristle offered a narrow structure to attach to.
- Result: A tower formed within two hours, supporting the idea that the orchard formations can be recreated under controlled conditions.
Wild towers and laboratory towers compared
| Feature | Wild observations | Laboratory replication |
|---|---|---|
| Location | Fallen apples and pears in orchards near Konstanz, Germany | Agar plate in a laboratory |
| Worms identified | Dauer-stage nematodes; species details are not stated in the report | Caenorhabditis elegans |
| Structure | Tower-like collective formation on fruit | Tower built around a toothbrush bristle |
| Response | Grew toward stimulation and attached to it | Formation observed under controlled conditions |
| Timing | Not stated | Formed within two hours |
What “superorganism” means here
In this context, “superorganism” is a description of coordinated group behavior. The worms remain separate animals, but their physical attachment and shared response produce a structure that behaves as a unit. Researchers are using the term to emphasize sensing, growth, and collective movement—not to claim that the worms have fused into a single body or that the tower is permanently stable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What remains unknown
- The number of worms in a typical tower and the maximum tower height.
- How frequently towers form in orchards or other natural habitats.
- How long an individual tower remains intact.
- Whether the same behavior occurs across multiple nematode species.
- How much faster or farther a tower transports worms than individual movement.
- Which environmental cues initiate tower formation in the wild.
Serena Ding, senior author and group leader at the Max Planck Institute of Animal Behavior, said she was “ecstatic” on seeing the natural towers. The observation turns a phenomenon known from laboratory settings into a documented part of nematode behavior in nature, while leaving its broader ecological importance to be determined.
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