Then came the twist. In 2018, a bushfire tore through the same forest. The main koala habitat was reduced to ash. But the Koala Windows—their polymer surfaces scorched but intact—stood. And weeks later, motion cameras showed surviving koalas using the windows not just to cross the tracks, but to reach a small unburned gully on the other side. The artificial trees had become a lifeline.
The results were astonishing. In a two-year trial along a 3-kilometer stretch of rail, koala mortality dropped by 91%. Gliders, possums, and even a goanna were recorded using the windows. The structures required no lighting, no moving parts, no electricity. They worked in drought and flood. koala windows
Enter the engineers. Traditional wildlife crossings—overpasses planted with native shrubs—were too expensive for this narrow rail corridor. Tunnels failed because koalas rarely enter dark, enclosed spaces on the ground. But a chance conversation between Lin and a structural engineer, Tomás Reyes, led to a radical idea. Reyes was designing a noise barrier for a new housing estate. "What if," he asked, "we make the barrier rough, planted, and vertical? A fake tree that's actually a real habitat?" Then came the twist
Reyes replied: "So we didn't build a crossing. We built a lesson." But the Koala Windows—their polymer surfaces scorched but
The first "Koala Window" was not a window at all. It was a 6-meter-high panel of recycled polymer, molded to mimic ironbark bark, with hidden ledges and woven vines of durable coir fiber. It was attached to the side of an existing overpass. It cost $4,000 AUD—less than one rail signal post replacement.