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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →These ten frogs are a selected group, not a complete worldwide count. Some are described as extinct, while others are only presumed or thought extinct, have not been seen for decades, or raise unresolved questions about whether they were distinct species at all.
What “extinct” means in this list
A frog missing from recent searches is not automatically an extinct frog. A formal extinction finding requires intensive, documented searches across the places and habitats where the species could still survive, with the methods and time span strong enough to make continued survival highly unlikely. The International Union for Conservation of Nature (IUCN) uses that kind of evidence in its Red List assessments, but current IUCN categories and accepted taxonomies for every frog below have not been independently checked here.
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The labels therefore matter. “Extinct” is a stronger claim than “presumed extinct” or “thought extinct.” “Missing” describes an observation gap, not a final verdict. A taxonomic reinterpretation can also change the story: if a named frog is genetically the same as another living species, its disappearance may represent the loss of a name or population rather than the extinction of a distinct species.
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The ten entries come from a list updated August 5, 2025. That page also gives a longer list of frog taxa, so the number ten refers only to the featured examples in this article.
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The ten featured frogs at a glance
| Frog | Region and habitat described in the list | Evidence or wording used |
|---|---|---|
| Pseudophilautus pardus | Sri Lanka; shrub-frog habitat | Presented as extinct; the source describes the holotype |
| Southern gastric-brooding frog (Rheobatrachus silus) | Australia | Last captive individual reportedly died in 1983 |
| Vegas Valley leopard frog (Lithobates fisheri) | Las Vegas Valley and Tule Springs, Nevada | Preserved samples were reported genetically identical to living Chiricahua leopard frogs |
| Günther’s streamlined frog (Nannophrys guentheri) | Sri Lanka | First specimens collected in 1882; not seen in the wild since, according to the list |
| Mount Glorious day frog (Taudactylus diurnus) | South-east Queensland, Australia | Not observed in the wild since 1979, according to the list |
| Splendid poison frog (Oophaga speciosa) | Western Panama near Costa Rica; humid lowland and montane forest | Described as considered extinct in 2020 |
| Spiny-knee leaf frog (Phrynomedusa fimbriata) | Near Paranapiacaba, São Paulo, Brazil | Known from one 1898 specimen; presumed extinct, but it may survive |
| Craugastor myllomyllon | Guatemala | Known from one specimen and described as unique to Guatemala |
| Corquin robber frog (Craugastor anciano) | Cordillera de Celaque, Honduras | Thought extinct; habitat degradation and chytridiomycosis are possible factors |
| Sierra de Omoa streamside frog (Craugastor omoaensis) | Sierra de Omoa, Honduras | No sightings since 2004; described as declared extinct in 2019 |
The ten frogs, and what is actually known
1. Sri Lanka shrub frog (Pseudophilautus pardus)
This Sri Lankan shrub frog is represented in the list by a description based on its holotype, the specimen used to define the name. That is important because a single historical specimen can provide a physical description while offering little evidence about population size, habitat breadth, or the date of disappearance. The scientific name is written here with a lowercase species epithet, following standard zoological style. A definitive modern extinction category would require checking current specialist and Red List records.
2. Southern gastric-brooding frog (Rheobatrachus silus)
This Australian frog became famous for an extraordinary reproductive behavior: after fertilization, the female swallowed the eggs, and the developing young grew inside her stomach before emerging through the esophagus. The adaptation temporarily turned the stomach into a nursery and suppressed normal digestion while the tadpoles developed. The list reports that the last southern gastric-brooding frog in captivity died in 1983. That date is an attribution from the listed account, not a substitute for a complete survey history in the wild.
3. Vegas Valley leopard frog (Lithobates fisheri)
The Vegas Valley leopard frog was described from Las Vegas Valley and Tule Springs in Nevada. Its case is taxonomically complicated: the list reports that preserved samples were later found to be genetically the same as living Chiricahua leopard frogs. If that result is accepted by the relevant taxonomic authorities, the disappearance may not represent the extinction of a genetically distinct species. Until the accepted taxonomy and status are checked against a specialist authority, it is safer to describe this as an identity question rather than an uncomplicated species extinction.
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4. Günther’s streamlined frog (Nannophrys guentheri)
The first specimens of Günther’s streamlined frog were collected in 1882. The featured account says the frog has not been seen in the wild since then and provides a physical description. A long interval without a confirmed observation is serious evidence, but it does not by itself establish how much suitable habitat was searched, which seasons were covered, or whether the frog’s formal status has changed. Those details determine how confidently “extinct” can be used.
5. Mount Glorious day frog (Taudactylus diurnus)
South-east Queensland was the stated range of the Mount Glorious day frog. The list says it had not been observed in the wild since 1979. The date marks the last reported observation in that account, not necessarily the date of extinction. For a strong conclusion, conservation biologists would need to examine survey effort after 1979, the condition of streams and upland forest, and whether disease or other pressures were documented rather than inferred.
6. Splendid poison frog (Oophaga speciosa)
The splendid poison frog was described as native to a small area of western Panama near Costa Rica. Its reported habitat included humid lowland and montane forest, two environments that can be difficult to survey consistently because terrain, weather, and access vary sharply. The featured page says it was considered extinct in 2020, but the text reviewed does not give a species-level assessment record or the survey details behind that wording. That limitation should stay attached to any summary of its status.
7. Spiny-knee leaf frog (Phrynomedusa fimbriata)
This Brazilian frog is known from a single specimen collected near Paranapiacaba, São Paulo, in 1898. The account explicitly calls it presumed extinct while adding that it may still exist. Those are not contradictory statements: a century-scale absence and an extremely small evidence base can justify urgent concern without proving that every individual is gone. Targeted searches in remaining Atlantic Forest habitat, using visual, environmental-DNA, and acoustic methods where appropriate, would be needed to improve confidence.
8. Craugastor myllomyllon
The list describes Craugastor myllomyllon as unique to Guatemala and known from one specimen. A one-specimen record leaves basic questions unanswered: the original population’s size, exact distribution, breeding site, and tolerance of habitat change. The name therefore belongs in a discussion of highly vulnerable or possibly lost frogs, but the evidence supplied here is too limited to treat every aspect of its current taxonomy and extinction category as settled.
9. Corquin robber frog (Craugastor anciano)
The Corquin robber frog was associated with Honduras’s Cordillera de Celaque and is described as thought extinct. Habitat degradation and chytridiomycosis are mentioned as possible factors. “Possible” is crucial: the account does not establish either pressure as the confirmed cause of disappearance. Chytrid disease has devastated many amphibian populations, but a species-by-species conclusion still requires pathology, historical records, habitat evidence, or other direct support.
10. Sierra de Omoa streamside frog (Craugastor omoaensis)
This frog was endemic to Honduras’s Sierra de Omoa. The featured account reports no sightings since 2004 and says it was declared extinct in 2019. The geographic qualification matters because an endemic species has no known population outside that mountain range; searches elsewhere cannot compensate for weak coverage in its original habitat. The declaration date should be read as the date given by that account, pending confirmation against the current authoritative assessment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why a missing frog is not automatically extinct
Brian Gratwicke, identified as a Smithsonian scientist and author of a Panama Amphibian Rescue and Conservation Project account, asks: “How do you prove a species is truly gone and not just extremely difficult to find?” The question captures the central problem. Frogs can be seasonal, nocturnal, quiet outside breeding periods, restricted to inaccessible ravines, or present at densities too low for ordinary daytime searches.
That project’s 2026 account describes rediscovering four frog populations that had been missing from central Panama forests. Autonomous acoustic recorders and pattern-matching software helped detect calls that people could overlook. The account reports more than 400 calls from Vicente’s dart frog in that region. Those findings demonstrate why survey design matters; they do not show that any of the ten frogs above survives.
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- Search the right conditions: Match surveys to breeding seasons, rainfall, temperature, elevation, and daily activity patterns.
- Use several detection methods: Combine visual encounter surveys with call monitoring, environmental DNA, camera or automated acoustic systems, and searches for eggs or tadpoles when suitable.
- Document effort: Record locations, dates, hours, weather, equipment, observers, and detection limits so another team can evaluate the result.
- Revisit historical sites: Check the original locality and nearby connected habitat rather than relying on a single visit.
- Separate evidence from explanation: A frog can be absent while the cause remains unknown; disease, habitat loss, pollution, invasive species, climate shifts, and collection pressure should not be treated as confirmed without supporting data.
What the wider amphibian crisis shows
A 2025 review in Nature Reviews Biodiversity reports that 41% of amphibian species are globally threatened, making amphibians the most threatened vertebrate group in that review. “Threatened” is a conservation-status category, not a count of species already extinct.
The same review reports 482 amphibian species declining in conservation status between 1980 and 2004, followed by 306 species declining between 2004 and 2022. It also records improvements: 35 species improved between 1980 and 2004, and 86 improved between 2004 and 2022. These figures describe changes in threat classification over defined periods, not extinction totals. They show both the scale of the crisis and the fact that protection, habitat work, disease management, captive assurance colonies, and reintroduction can improve outcomes.
How to read lists of extinct frogs responsibly
- Check the exact status wording. “Extinct,” “presumed extinct,” “thought extinct,” and “not seen” carry different levels of certainty.
- Check the date and authority. A declaration from one article may not match a later Red List assessment or a revised taxonomic treatment.
- Check the last confirmed record. A year such as 1979 or 2004 is a last-observation marker unless the source explicitly documents a formal extinction assessment.
- Check the identity. Genetic work can merge a named form with a living species, as the Vegas Valley leopard frog example illustrates.
- Check the geography. Endemic frogs may be confined to one valley, mountain range, or forest type, so the quality of searches in that precise area is decisive.
- Check proposed causes separately. A plausible threat is not the same as a demonstrated cause of extinction.
These ten cases are therefore best understood as a cross-section of loss, uncertainty, and taxonomic change. They include frogs with remarkable biology, species known from very small amounts of evidence, and names whose status depends on ongoing scientific interpretation. Treating every entry as equally and unambiguously extinct would erase the distinctions that determine what conservationists should do next.
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