Endangered Bogong Moths Return in Huge Numbers Across Southeast Australia

Large numbers of endangered bogong moths have appeared across parts of southeastern Australia, surprising residents and giving scientists an encouraging sign that the species may be recovering.

The moths have been reported across New South Wales, the Australian Capital Territory and parts of Victoria as they begin their annual migration toward the cooler Australian Alps.

Thousands of Moths Appear Around Homes

Residents in several areas have reported seeing large groups of bogong moths gathering around houses, windows, cars and outdoor spaces.

In Batemans Bay, New South Wales, one resident described thousands of moths gathering around her home. More than 800 sightings had also been recorded on the citizen science platform iNaturalist within a few days.

A Long Annual Journey

Bogong moths migrate hundreds of kilometres toward the Australian Alps to escape the warmer conditions of summer. They gather in cool mountain caves and rocky areas before eventually returning to inland regions.

The insects are only a few centimetres long, but their migration is an important part of the ecosystem. They provide food for birds, mammals and the critically endangered mountain pygmy-possum.

A Species That Has Suffered Major Declines

Bogong moth populations have experienced severe declines since the 1980s because of drought and rising temperatures.

In 2017, the population fell by as much as 99.5 percent, and the species was listed as endangered in 2021 by the International Union for Conservation of Nature.

Why Are There So Many This Year?

Scientists are still studying the reasons behind the unusually large numbers being seen this year. Researchers believe increased rainfall in northern parts of New South Wales may have provided better conditions for moth larvae.

Warmer winter conditions and strong northwesterly winds may also have helped the insects travel toward the mountains during their migration.

Researchers See a Positive Sign

Scientists studying bogong moths say the large numbers are encouraging after several years in which sightings became much less common.

Researchers are asking members of the public to photograph the moths and record sightings on citizen science platforms. The information can help scientists understand where the insects are travelling and how their populations are changing.

People Can Help the Moths

Experts recommend turning off unnecessary outdoor lights because artificial light can interfere with the moths’ movements. People are also encouraged to keep cats indoors and avoid using insecticides around the insects.

Researchers say the moths are not intentionally entering homes. They are continuing their natural migration and may simply be attracted to artificial light along the way.

Sources

• ABC News Australia — “Endangered bogong moths swarming into homes across NSW” — September 28, 2026.
• SBS News — “‘A story of hope’: Bogong Moths swarming the east coast are exciting researchers” — September 28, 2026.
• BBC News — “Why are these endangered moths swarming Australia’s east coast?” — October 2, 2026.