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Short answer: Scientists have not resurrected a dead animal or discovered a naturally occurring zombie species. A 2026 Memorial University report describes sea-cucumber tissue fragments that repaired and maintained themselves for more than three years outside the animal. Separate laboratory studies produced frog-cell xenobots and human-cell anthrobots that move, organize themselves and perform limited tasks. Researchers call this boundary problem a possible “third state” between ordinary life and death—not proof that death has been overturned.
What Memorial University found in sea-cucumber tissue
Fragments that stayed active for more than three years
The direct match for the “zombie organism” headline involves the cold-water sea cucumber Psolus fabricii. Researchers removed fragments from tube feet, tentacles and the main body, then kept them in flowing, non-sterile seawater. According to Memorial University’s 2026 account, the pieces repaired damage, reorganized and remained independently biologically active for more than three years.
Study lead Sara Jobson described the observation this way: “We’re seeing something that hasn’t been documented before in this kind of environment.” The university says it may be the first known example of long-term tissue survival and growth outside a living organism under natural conditions.
Why this is not a resurrected sea cucumber
The fragments did not reassemble into a complete animal. Memorial University explicitly says they were “aren’t developing into new individuals, but they are continuing to function as self-sustaining biological units.” They are persistent, organized pieces of tissue, not a revived Psolus fabricii, a new species or an animal reproducing on its own.
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That distinction matters because death occurs at several biological levels. The death of an organism stops its integrated circulation, nervous-system activity and coordinated behavior, but cells and tissues can remain viable for different periods if their conditions still provide what they need.
What scientists mean by a “third state”
In an explainer written by researchers Peter A. Noble and Alex Pozhitkov, a “third state” is proposed for cases in which cells from a dead or dying organism do more than merely survive. With nutrients, oxygen, bioelectric signals or biochemical cues, some cells can reorganize into multicellular structures with functions that were not present in the original tissue.
The phrase is a conceptual framework, not a formal declaration that death no longer exists. It asks whether the life–death binary is sufficient for describing cells that remain viable and acquire new organization after the source organism has died.
Xenobots: frog cells with a new job
Xenobots are laboratory biobots made from frog cells. In the examples discussed by Noble and Pozhitkov, skin cells taken from deceased frog embryos reorganized into multicellular structures. Their cilia normally help move mucus in a frog embryo; in the xenobots, those same structures became locomotion machinery.
Some xenobots also showed kinematic self-replication: they gathered and arranged loose cells into copies with similar form and function. This is physical replication of a structure, not ordinary growth through the usual cell-division cycle.
Anthrobots: human lung cells that self-assemble
The primary Advanced Science study published in 2023 reported anthrobots made from adult human lung cells. Each began as one lung cell and self-constructed into a motile multicellular biobot in culture. The researchers used neither direct genetic editing nor manual sculpting to build the individual structures.
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The reported anthrobots ranged from 30 to 500 micrometres in diameter, moved at approximately 5 to 50 micrometres per second and remained in culture for 45 to 60 days. In laboratory dishes, they traversed cultured human neural-cell sheets and induced rapid repair of scratches in those sheets.
Sea-cucumber tissue, xenobots and anthrobots compared
| Example | Starting material | Environment | Emergent behavior | Observed duration | New individual? |
|---|---|---|---|---|---|
| Sea-cucumber fragments | Tube feet, tentacles and body tissue from Psolus fabricii | Flowing, non-sterile seawater under the conditions reported by Memorial University | Repair, reorganization and continuing biological activity | More than three years of independent activity, according to the university’s 2026 report | No; the fragments did not develop into new sea cucumbers |
| Xenobots | Frog skin cells from deceased embryos | Controlled laboratory culture | Movement using repurposed cilia; some forms showed kinematic self-replication | Not stated in the cited explainer | No naturally occurring frog; a laboratory-formed biobot |
| Anthrobots | One adult human lung cell per starting construct | Controlled cell culture | Self-assembly, movement and interaction with scratched neural-cell sheets | 45–60 days in culture, in the 2023 Advanced Science study | No human or animal individual; a multicellular laboratory biobot |
Can cells live after an animal dies?
Yes, but “live” must be specified. A cell may retain metabolism, repair capacity or the ability to respond to signals after the organism that contained it has died. Survival depends on oxygen, nutrients, temperature, waste removal, electrical conditions and the tissue’s own structure.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe sea-cucumber result is unusual because the fragments remained self-maintaining for years in flowing seawater rather than briefly surviving in a sterile dish. Xenobots and anthrobots are different: their behaviors emerged in carefully controlled cultures designed to keep cells supplied and to encourage organization.
None of these findings shows that a dead animal’s mind, memories or whole-body functions continue. There is no evidence here of consciousness, sensation or a restored nervous system.
Are xenobots and anthrobots alive?
They display several life-like properties—organized cells, metabolism, movement, repair and, in some xenobots, replication of a form. Whether that makes them “organisms” depends on the definition being used. They are not naturally evolved species, and their capabilities are bounded by the laboratory conditions that support them.
A 2026 perspective in npj Systems Biology and Applications frames the issue with two concepts. A viability region is the range of states a cell can occupy and still survive under particular constraints. The viability boundary is the last range of states in which it is reasonable to call the cell alive. This is conceptual and computational work; it does not show that sea-cucumber fragments or biobots are conscious.
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Does this mean scientists discovered “life after death”?
Not in the everyday sense. The evidence supports three narrower conclusions:
- Organismal death does not instantly deactivate every cell or tissue.
- Some excised tissues can remain organized and active for unexpectedly long periods when their environment supports them.
- Cells can sometimes be redirected by culture conditions into multicellular structures with movements or functions unlike those of the source tissue.
It does not support claims that a dead animal was brought back, that sea-cucumber tissue reproduced, or that a new naturally occurring species has appeared.
What could the technology be used for?
Drug delivery, targeted repair and other medical uses have been proposed for biobots, but those applications remain prospective. The anthrobot study’s neural repair result was performed on cultured human cell sheets in vitro. It was not a treatment in people, and the cited work does not establish safety, behavior inside a body, persistence after implantation or clinical effectiveness.
The sea-cucumber finding may provide a model for studying tissue resilience, regeneration and survival outside an intact organism. Its value is biological understanding, not evidence of a ready-made therapy.
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“Between life and death” captures a genuine scientific boundary problem: tissue can remain viable after the organism is dead, and cells can sometimes build new multicellular arrangements. “New organism,” however, overstates the sea-cucumber result and blurs it with laboratory biobots.
The most precise description is therefore two related discoveries. Memorial University reported exceptionally persistent sea-cucumber tissue that did not become a new animal. Other researchers created xenobots and anthrobots whose emergent behaviors motivate the proposed “third state.” Together they expand the vocabulary for talking about cellular life at the edge of death without demonstrating resurrection.
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