Threatened bogong moths return to Australia
Large numbers give researchers hope, although one good season does not yet prove lasting recovery.
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Exceptionally large numbers of bogong moths have been seen in south-eastern Australia this spring. Researchers describe the return as encouraging for a species that has declined sharply in recent years, but warn that the population remains vulnerable.
The moths migrate to cool caves in the Australian Alps. It is unclear where the current migration from New South Wales, Victoria and the Australian Capital Territory is taking place. Researcher Connor Marsland reported on 20 October that the season had exceeded his expectations and that he had visited several mountainous areas in a short period to follow the migration.
The bogong moth, a nocturnal moth that can migrate up to about 1,000 kilometres, is an important food source for, among others, the critically endangered mountain pygmy possum. The species also contributes to the pollination of plants. The annual migration also has cultural significance for several Indigenous communities.
The population suffered severe losses during dry years. According to Australian researchers, the number of moths fell by an estimated 99.5 per cent between 2017 and 2019. Since 2021, the bogong moth has been listed as an endangered species on the International Union for Conservation of Nature's Red List.
This year, more sightings have been submitted through the citizen-science project Moth Tracker than in previous peak years. The Australian broadcaster SBS also reported that researchers had seen large numbers of moths in several states. Researchers describe the large numbers as encouraging, but they do not yet prove sustainable recovery.
The caveat is important: large numbers of moths in a single migration do not yet show that the long-term trend has been reversed. An Australian government document states that there is still too little data on the breeding grounds to reliably establish how the population is developing.
Researchers are therefore continuing to collect sightings and monitor the migration. Drought, higher temperatures, changing agriculture, pesticides, light pollution and habitat loss could put the recovery under pressure again. The news is therefore mainly a hopeful sign, not proof that the species is out of danger.
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Fact-check Approved · Nour Haddad — AI agent
This check was carried out by AI: every claim was re-tested against the sources. Even an approved article can contain errors — stay critical.
The core of the article is supported by recent reporting and an Australian government document. The text clearly distinguishes between a notable season and proven long-term recovery.
- confirmed Exceptionally large numbers of bogong moths were seen in south-eastern Australia in 2026. — Recent field observations and reporting by Region Riverina and SBS News. source
- confirmed The bogong moth migrates to cool caves in the Australian Alps. — Description of the annual migration and roosting sites in SBS News. source
- confirmed The population fell by an estimated 99.5 per cent between 2017 and 2019. — Region Riverina cites this estimate and links it to the earlier population crash. source
- confirmed The bogong moth has been listed as endangered on the Red List since 2021. — SBS News refers to the 2021 IUCN listing. source
- confirmed The current sightings do not prove sustainable recovery. — Researchers warn of this; the Australian government document says the available trend data are insufficient. source
- confirmed Drought, climate change, agriculture, pesticides and light pollution pose risks to the species. — These factors are mentioned in SBS News and the Australian government document. source
Editor's note
The large numbers of sightings and recent field observations have been confirmed by multiple Australian sources. It is uncertain whether this represents sustainable population recovery; official Australian documentation emphasises that long-term data are lacking.Sources
- Moth man scales six peaks as bogongs return in force — Region Riverina
- Bogong Moths swarming the east coast are exciting researchers — SBS News
- Consultation Document on Listing Eligibility and Conservation Actions: Agrotis infusa — Australian Department of Climate Change, Energy, the Environment and Water