Australia's 'Goldilocks' Nests Save Endangered Gliders

Dr. Kita Ashman wasn't sure what to expect when she checked the second nesting box installed in Australia's old-growth forests. When she found an endangered greater glider curled up inside, she couldn't hold back tears of joy.

Greater gliders are fluffy, big-eared marsupials found nowhere else on Earth. These nocturnal creatures can glide up to 100 meters between trees and call the forests of eastern Australia home.

But their population has crashed by 80% in the past 20 years. The devastating 2019-2020 bushfires destroyed a third of their remaining habitat, including the tree hollows they depend on for nesting.

Here's the problem: those hollows take over 100 years to form naturally. Standard nesting boxes don't work either because greater gliders overheat easily, and heat-stressed gliders stop eating enough to survive.

Enter the "Goldilocks box." Researchers from Australian National University, Greening Australia, and WWF-Australia designed insulated nesting boxes with heat-reflective, fire-resistant coatings to keep gliders at just the right temperature.

The team installed over 200 boxes in Victoria's East Gippsland and Tallaganda National Park in New South Wales, hoping the gliders would actually use them. No one knew if the expensive intervention would work.

Why This Inspires

The results exceeded every hope. A 2025 study found that 100% of the boxes were occupied within one year, with gliders moving in after an average of just 34 days.

"What we didn't know was whether these boxes worked," said Dr. Kara Youngentob, an ANU research fellow. "Much to our delight, within a few months of them going up they are already being used by gliders."

The project is now expanding across Australia, giving researchers better data on wild populations while providing crucial shelter for the endangered species. The boxes also help gliders adapt to climate change by protecting them from temperature extremes.

"They're a treasure for this country," Youngentob told ANU. "And I think the more people know about them, the more that they will fall in love with them and want to protect them too."

Greater gliders now have a fighting chance at survival, one perfectly designed box at a time.