In early 2026, successive heatwaves across south-eastern Australia devastated flying fox populations, large fruit bats vital as pollinators and seed dispersers for native forests.
A particularly severe event in late January struck the colony at Naracoorte in South Australia, where a camp of roughly 1,000 grey-headed flying foxes suffered catastrophic losses.
More than 80% perished, leaving only about 180 survivors, including 34 vulnerable babies now under intensive care by wildlife volunteers who anticipate months of recovery for the orphans facing dehydration, wing damage, and separation from their mothers.
Flying foxes cannot sweat effectively and rely on wing fanning, panting, and seeking shade to cool down. When temperatures exceed 42°C, hyperthermia sets in rapidly, causing organ failure, convulsions, and death—often within hours.
They cluster in the coolest parts of trees, but extreme heat overwhelms even those refuges, leading to mass falls from branches.
This Naracoorte wipeout followed an earlier January heatwave that ranked as the worst mass mortality since the 2019–20 Black Summer fires, killing thousands across Victoria, New South Wales, and South Australia.
Reports documented hundreds dead at individual sites near Melbourne and Wollongong, with overall national tolls in the thousands amid record-breaking highs nearing 43–45°C in multiple regions.
These events highlight the vulnerability of grey-headed flying foxes, already listed as vulnerable under Australian law, to intensifying climate-driven heat.
Widespread deaths disrupt ecosystems, as the bats play a key role in regenerating eucalypt forests and supporting species like koalas through pollination.
Wildlife rescuers and experts warn that without stronger heat mitigation—such as urban tree planting, water sources, and shade provision—such biblical-scale losses may become more frequent, pushing populations closer to collapse.
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