Is the Tasmanian Tiger Really Extinct?

Background

The thylacine, commonly known as the Tasmanian tiger for the dark stripes across its lower back, was the largest carnivorous marsupial of modern times, a dog-sized predator once found across mainland Australia and New Guinea before surviving, by the time Europeans arrived, only in Tasmania. Competition from dingoes on the mainland and, in Tasmania, an intensive bounty scheme the colonial government ran from 1888 to 1909 to protect sheep farming, drove the species into steep decline through the late nineteenth and early twentieth centuries. The last thylacine known to have been captured in the wild died at Hobart Zoo on 7 September 1936, an animal popularly, though not officially, referred to as "Benjamin," a name that does not appear in the zoo's own contemporary records and whose origin is unclear.

Tasmania's government did not formally protect the species until 59 days before that final captive death, and international conservation bodies took decades to update the thylacine's status to match the accumulating silence. The International Union for Conservation of Nature listed it as extinct in 1982, and the Australian government's own Environment Protection and Biodiversity Conservation Act followed in 1986, fifty years after the Hobart Zoo death, the standard waiting period conservation law applies before declaring a species extinct in the absence of confirmed sightings.

The Case for Extinction

The formal case rests on an absence that has now lasted nine decades: no thylacine body, complete skin, authenticated track cast, or genetic sample has been recovered since 1936, despite organised search expeditions, camera-trap programmes, and a standing bounty offered at various points by Tasmanian tourism bodies and news outlets for verifiable proof. Thousands of reported sightings have accumulated in that time, but the pattern search researchers describe is consistent with mistaken identification rather than a surviving population: reported sightings actually declined in areas where thylacine habitat was most heavily cleared, the opposite of what a genuine surviving population's reporting pattern would be expected to show, and photographic or video "proof" that periodically resurfaces has, without exception, been identified on closer analysis as a foreign fox, a mangy dog, or another known animal.

A 2017 study published in Conservation Biology by ecologist Colin J. Carlson and colleagues formalised that case statistically. Using a Bayesian framework that modelled physical evidence, expert-validated sightings, and unconfirmed public reports as separate, independently weighted data streams, the study estimated the most likely extinction date at around 1940, with a plausible upper bound in the 1950s, and calculated the probability that a thylacine population survived to the present at roughly one in 1.6 trillion. The paper's authors drew an explicit parallel to searches for the ivory-billed woodpecker and other "Lazarus species" whose continued search efforts have, in their assessment, been statistically unlikely to succeed.

The Case for Later Survival

A 2023 study from the University of Tasmania, published in Science of the Total Environment, reached a markedly different conclusion using a larger and differently weighted dataset. Researchers built the Tasmanian Thylacine Sighting Records Database, compiling and quality-rating 1,223 sighting and physical-evidence records spanning 1910 to 2019, then modelled the extinction date using less restrictive assumptions about which categories of report carried genuine information rather than treating unconfirmed sightings as uniformly unreliable. That model placed the most probable extinction window in the 1980s, with a plausible tail extending to the late 1990s or early 2000s, decades later than the 2017 estimate.

The disagreement between the two studies is not a disagreement about the underlying sighting records, both draw on largely the same body of report data, but about how much weight an unconfirmed public sighting should carry in a statistical extinction model. The 2017 approach treats the absence of physical proof as close to decisive; the 2023 approach treats a large, geographically clustered volume of consistent low-confidence reports as itself weak but genuine evidence worth modelling rather than discarding. Neither study reports new physical evidence of a surviving animal; both are reanalyses of historical sighting and evidence records using different statistical assumptions.

The De-Extinction Effort

Rather than searching for survivors, the Texas-based biotechnology company Colossal Biosciences has pursued a separate approach since announcing its thylacine project in 2022: engineering a living approximation of the species through genetic editing rather than rediscovery. The project uses the fat-tailed dunnart, a small living marsupial whose genome is close enough to the thylacine's to serve as an editing base, introducing thylacine-derived genetic sequences reconstructed from museum specimens. As of 2025, Colossal reported producing what it described as the most extensively edited animal cell line to date, with several hundred genetic changes, alongside progress on an artificial-uterus system that has achieved mid-gestation marsupial embryo development, though no living animal has yet resulted.

The project is scientifically and ethically distinct from the extinction-date question this page otherwise addresses: it neither depends on nor bears on whether any wild thylacine survived past 1936, and conservation biologists remain divided on whether a successfully edited dunnart-thylacine hybrid would constitute a genuine restoration of the species or a new, thylacine-like organism built to resemble one. Colossal's other headline claim, that it had brought back the dire wolf, went further in April 2025, announcing living pups rather than an in-progress cell line, and drew exactly the definitional pushback the thylacine project has so far avoided by not yet producing an animal to argue about.

Common Misconceptions

The last captive thylacine is widely reported to have been named "Benjamin," a detail that does not appear in Hobart Zoo's own surviving records and whose source cannot be traced to a contemporary account; the animal's sex was not even conclusively recorded at the time. The species is also sometimes described as a "tiger" in a taxonomic sense; the thylacine was a marsupial, unrelated to true tigers, and its striped appearance is a case of convergent evolution rather than shared ancestry. Periodic viral photographs and trail-camera clips claiming to show a living thylacine, including several widely shared in the 2020s, have each been examined and attributed to foxes, dogs, or other misidentified animals rather than withstanding independent verification.

Current Consensus

The scientific consensus holds the thylacine to be extinct, formally so since 1986, with no confirmed physical evidence of survival in the nine decades since the last captive death. Genuine scientific disagreement exists only over the statistical extinction-date estimate itself, whether the species most likely died out within a few years of 1936, as the 2017 model concluded, or persisted in small numbers for several further decades, as the 2023 model's less restrictive assumptions suggested, not over whether any thylacine survives today. Both research teams treat continued search efforts as separate from, and largely unlikely to resolve, that statistical question.

Why This Mystery Endures

The thylacine endures as Australia's defining "Lazarus species" candidate because it combines two things that rarely coincide: photographic and even filmed evidence, including 1930s footage of the species alive at Hobart Zoo, giving the animal an unusually vivid, undisputed presence right up until its documented disappearance, and a confirmed history of official neglect, no legal protection until 59 days before the last captive death, that makes the possibility of an overlooked surviving population feel less like fantasy than a plausible failure of the historical record. That combination is genuinely different from most cryptid claims on this site, since the thylacine did, without dispute, exist; the open question is only how long after 1936 it continued to.

The mystery also endures because it now has an active, well-funded second act. Colossal Biosciences' de-extinction programme keeps the species in the news independently of any new sighting, giving thylacine coverage a forward-looking momentum most extinction stories lack. The New Zealand moose, introduced deliberately in 1910 and never formally declared extinct despite the same decades of unconfirmed reports, is this site's closest parallel: a case where, unlike the thylacine, the species indisputably still existed as recently as living memory and only its continued persistence, not its historical reality, is in question. Australia's reported big cats offer a different comparison again, a cryptid claim about an animal with no confirmed original population at all, tested through the same kind of formal government inquiry the thylacine has never received. This page is part of this site's broader other cryptids coverage.