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Entry 145Filed under Breeding

Can Scientists Bring Back the Thylacine? What the Tasmanian Tiger Project Has Achieved

The Tasmanian tiger project aims at a thylacine-like proxy. Here is what the reported genome milestone means—and why it is not a resurrection yet.
3-minute read By Animalso Team
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The long-extinct predator in this headline is the thylacine, also known as the Tasmanian tiger. The University of Melbourne and Colossal Biosciences have reported research toward making a thylacine-like animal, but the available institutional updates through August 2025 do not report a live thylacine or confirm an imminent birth. The scientifically careful description is an attempt to create a proxy—not to restore the original species exactly.

What scientists mean by “bringing back” the thylacine

The project’s described approach is to use the thylacine’s reconstructed genome to identify genetic differences from living marsupials, then investigate whether selected changes could be made in a living relative. The University of Melbourne’s Pask Lab says researchers are using the fat-tailed dunnart as a model to develop techniques relevant to later stages.

That is different from recovering the extinct animal itself. The IUCN Species Survival Commission’s 2016 guidance warns that “de-extinction” can imply a faithful restoration that current approaches cannot deliver. It recommends thinking in terms of a proxy: an animal intended to represent some traits or ecological functions of an extinct species.

What the project has reported—and what remains distinct

In October 2024, the University of Melbourne announced a reconstructed thylacine genome that it estimated to be more than 99.9 per cent accurate. That figure describes the project’s estimate for the genome reconstruction; it is not a measure of how much of a thylacine has been recreated, the probability of success, or proof that the remaining biological challenges are solved.

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Milestone What the cited updates establish
Genome reconstruction The University of Melbourne reported its more-than-99.9-per-cent accuracy estimate in October 2024.
Identifying and editing differences The Pask Lab describes comparing thylacine and living marsupial genomes to find differences that may need editing into a living relative. It does not describe this as a completed thylacine genome edit.
Reproductive methods The Pask Lab says the fat-tailed dunnart model is being used to develop relevant techniques. Later steps are described as in development.
Live birth, health and persistence The cited institutional updates do not report a live animal or establish that a proxy has been born, is healthy, or could persist outside a research setting.

These are separate hurdles, not interchangeable ways of saying an animal has been “brought back.” A genome assembly does not by itself demonstrate successful cell engineering, embryo development, gestation, live birth, health or long-term survival.

Is a thylacine really about to be born?

The headline’s “about to” language is not supported by a verified birth date in the cited institutional updates. In August 2025, the University of Melbourne reported that Professor Andrew Pask had become Colossal’s Chief Biology Officer and that Australian Colossal-affiliated activities, including thylacine work, would be consolidated into Colossal Australia. That is an organizational update, not a birth milestone.

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Any projected timetable should therefore be treated as a forecast attributed to whoever made it, not as a confirmed schedule. The updates cited here establish research activity and project milestones, not an imminent birth.

What a thylacine-like proxy could—and could not—mean

A proxy might share selected genetic or physical traits with the thylacine, but that would not establish identity with the extinct animal. The IUCN guidance notes that a proxy cannot be assumed to reproduce an extinct species in its full genetic, behavioral and physiological entirety. The project description also leaves open which traits could be reconstructed and which could not.

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Professor Andrew Pask, in the University of Melbourne’s October 2024 announcement, said: “Not only are these major milestones for the thylacine de-extinction project, but the advancements by Colossal in partnership with the University of Melbourne for improving assisted reproductive technologies in marsupials can be applied across the marsupial family tree.” That statement describes possible wider relevance of reproductive technology; it is not evidence that a thylacine has been created.

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What would have to be weighed before any conservation use

Producing a proxy would not, on its own, show that releasing it would help ecosystems or be safe. The IUCN’s 2016 guidance points to questions that would need careful assessment:

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  • Ecological purpose: What function is the animal expected to serve, and could living species provide that function?
  • Habitat and impacts: Is suitable habitat available, and what risks could the proxy pose to existing species or face from disease?
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The guidance supplies general conservation principles, not a project-specific assessment or evidence that these questions have been resolved for the thylacine effort.

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