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Bogong moth migration in Australia

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2026-09-29 06:38 UTC → 2026-10-02 10:30 UTC · added ~~removed~~

Endangered Bogong moths have begun their annual migration through New South Wales and the Australian Capital Territory. In late September, large numbers of the insects were reported swarming residential areas in Sydney suburbs, the NSW south coast, and the Hawkesbury region, often clustering around windows and street lights. Authorities and experts have clarified that these swarms are a natural migratory phenomenon rather than a pest infestation. The moths travel from breeding grounds toward the Australian Alps to seek cooler temperatures in alpine caves for summer hibernation. Experts note that low-level jet streams are currently aiding the migration, which is expected to continue until early November. While the influx has caused some concern among residents regarding potential damage to linens and clothing, ecologists view the movement as a positive sign for the local ecosystem. The moths serve as a vital food source for bird species, such as magpies, following years of concerningly low insect numbers. Recent reports indicate that thousands of moths have covered homes and vehicles across southeastern Australia. Approximately 9,000 sightings have been recorded on the citizen science platform iNaturalist, though the actual number may be higher. This sudden concentration has drawn significant scientific attention because the species has faced sustained population decreases since the 1980s due to droughts and rising temperatures. Following a population collapse of up to 99.5% in 2017, the moth was added to the IUCN Red List as an endangered species in 2021. Researchers are now using this influx to gather data on migration and reproduction, though it remains unclear if this represents a stable recovery.

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