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Historical Thylacine Survival Reports After 1936

Evidence Dossier: A record proves that a statement, transfer, examination, or result was documented. It does not automatically prove the anomalous interpretation attached to it.
OverviewEvidenceTimelineAnalysisSources
1936-09-07, 2019-09-19
Tasmania, Nullarbor Plain
9/10
3/10
Thylacine populations may have persisted in remote Tasmanian wilderness after 1936.
low

Investigative Assessments

"The reported claim remains worth testing against the record: Thylacine populations may have persisted in remote Tasmanian wilderness after 1936. The strongest documented reasons to keep the file open are: Right to Information Disclosure RTI 025 2019 20: Documents that sightings continue to be reported to wildlife authorities by the public; A retrospective assessment of 20th century thylacine populations: Provides scientific analysis of the probability of thylacine survival into the mid to late 20th century. Key unresolved lead: What is the statistical reliability of post-1936 sighting reports?"
"Evidentiary limitations: low Note that: Right to Information Disclosure RTI 025 2019 20 fails to support: Does not provide physical or photographic proof of survival; A retrospective assessment of 20th century thylacine populations fails to support: Does not confirm the existence of a living population today. Documented contradiction: Lack of physical roadkill, hair, or DNA specimen confirmation post-1936. Leading conventional hypothesis: Feral dogs and mangy red foxes misidentified under poor lighting."

Case Summary

Following the death of the last known captive thylacine in Hobart Zoo in September 1936, unconfirmed sighting reports persisted across Tasmania and mainland Australia. Official government files, Right to Information disclosures, and scientific retrospectives document post-1936 search efforts, physical evidence evaluations, and zoological distribution baselines.

Evidence Locker

3 inspectable evidence items. Claims and source findings are kept separate.

government_report Local copy hash-verified Complete source

Right to Information Disclosure RTI 025 2019 20

Analyst rating: Official government log of unconfirmed public sighting reports from 2016 to 2019.

“Sighting that she believes was of a Tasmanian Tiger and two cubs at Hartz Mountain on Saturday”
Record locationPage 1
Evidence classofficial_record
Relationship to claimcorroborates
Authenticity assessmentverified
What this supportsDocuments that sightings continue to be reported to wildlife authorities by the public.
What it does not supportDoes not provide physical or photographic proof of survival.
ProvenanceReleased by the Tasmanian Department of Primary Industries, Parks, Water and Environment (DPIPWE) under the RTI Act.
Chain of custodyOfficial government internal records to public RTI release to Internet Archive upload to local PDF.
Source completenessComplete. The full 5 page government RTI disclosure is preserved.
Known gaps: No known completeness gaps recorded.
Open Complete Source (Local PDF Document) Download Copy Canonical Agency Record
article Local copy hash-verified Complete source

A retrospective assessment of 20th century thylacine populations

Analyst rating: Scientific review analyzing historical sighting records and bounty records to evaluate the decline of the thylacine.

“island of Tasmania afforded the thylacine a refuge from”
Record locationPage 102
Evidence classscientific_critique
Relationship to claimcorroborates
Authenticity assessmentverified
What this supportsProvides scientific analysis of the probability of thylacine survival into the mid to late 20th century.
What it does not supportDoes not confirm the existence of a living population today.
ProvenancePublished in the peer-reviewed journal Australian Zoologist.
Chain of custodyOriginal journal publication to digitisation by BioStor to Internet Archive to local PDF.
Source completenessComplete. The full article text is preserved.
Known gaps: No known completeness gaps recorded.
Open Complete Source (Local PDF Document) Download Copy Canonical Agency Record
article Local copy hash-verified Complete source

Extinction of the Thylacine Preprint

Analyst rating: Preprint of a major scientific modeling study evaluating the extinction date of the thylacine using a database of 1237 reports.

“Contrary to expectations, the inferred extinction window is wide and relatively recent, spanning”
Record locationPage 2
Evidence classscientific_critique
Relationship to claimcorroborates
Authenticity assessmentverified
What this supportsSuggests the thylacine likely persisted in the wild into the 1980s or 1990s.
What it does not supportDoes not claim that the species is currently extant.
ProvenanceSourced from the bioRxiv repository.
Chain of custodyAuthors' submission to bioRxiv server to local PDF download.
Source completenessComplete. The complete preprint text of the manuscript is preserved.
Known gaps: No known completeness gaps recorded.
Open Complete Source (Local PDF Document) Download Copy Canonical Agency Record

Documented Timeline

  • 1936-09-07: Last captive thylacine dies at Hobart Zoo.
  • 1967-03-21: Mummified Nullarbor thylacine specimen radiocarbon dated.
  • 2019-09-19: Tasmanian DPIPWE releases RTI disclosure of public sighting reports.

Named Participants and Roles

  • Tasmanian wilderness visitors and landholders, Sighting report submitters. Account basis: Retrospective. Witness quality: Moderate. Reports submitted to government wildlife agency, but unverified by physical specimen or clear photograph. Evidence: ev_tasmania_rti_2019

Contradictions and Record Conflicts

  • Lack of physical roadkill, hair, or DNA specimen confirmation post-1936.

Conventional Explanations

  • Feral dogs and mangy red foxes misidentified under poor lighting.
    Evidence for: Widespread presence of introduced canine and fox species in Tasmania.
    Limits: Does not easily account for experienced bushmen reporting striped hindquarters.
    Evidence: ev_australian_zoologist_2016

Evidence Stance Matrix

HypothesisStanceRationaleEvidence IDs
Survival of small isolated thylacine breeding groups into mid to late 20th centurySupportsStatistical modeling of the sighting logs suggests persistence in remote areas well past 1936.ev_tasmania_rti_2019, ev_brook_2021_biorxiv
Misidentification of feral dogs, cats, or wallabiesSupportsScientific reviews indicate that feral canines and other native fauna can be misidentified as thylacines in poor conditions.ev_australian_zoologist_2016
Unsubstantiated public reports lacking physical specimen backingSupportsOfficial records and scientific critiques verify that despite hundreds of claims, no physical evidence has been collected post-1936.ev_australian_zoologist_2016, ev_brook_2021_biorxiv

Missing Evidence

  • Physical carcass, hair sample, or clear genetic material post-1936
    Definitive proof required to establish survival beyond captive extinction date.

What Remains Unresolved

  • Clustered spatial distribution of historical sighting reports in southwestern Tasmania
    Statistical analysis shows non-random clustering in wilderness fringe areas.

Investigative Hypotheses

  • Survival of small isolated thylacine breeding groups into mid to late 20th century
  • Misidentification of feral dogs, cats, or wallabies
  • Unsubstantiated public reports lacking physical specimen backing

Open Questions

  • What is the statistical reliability of post-1936 sighting reports?
  • Could small breeding populations survive in remote and unsurveyed regions of Tasmania?
  • Is there any validated post-1936 physical footprint or hair evidence?

Archival Landing Pages and Evidence Corpus

Right to Information Disclosure RTI 025 2019 20

Government Report Local Source Verified

External URL: https://archive.org/details/rti-025-2019-20

Open Local Artifact (PDF Document) · Download Copy

A retrospective assessment of 20th century thylacine populations

Scientific Critique Local Source Verified

External URL: https://archive.org/details/australian-zoologist-38-102-129

Open Local Artifact (PDF Document) · Download Copy

Extinction of the Thylacine Preprint

Scientific Critique Local Source Verified

External URL: https://www.biorxiv.org/content/10.1101/2021.01.18.427214v1

Open Local Artifact (PDF Document) · Download Copy