Koala Windows -

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.

But the heart of the story remains a single email. After the bushfire, Dr. Lin wrote to Reyes: "Bumpy made it. She used the window three times in one night. Her joey was with her. She showed him how."

Today, Koala Windows are standard infrastructure on new road and rail projects in Queensland and New South Wales. They have been adapted for squirrel gliders (smaller ledges), spotted-tailed quolls (wider platforms), and even tree frogs (grooves that hold water). The design was open-sourced by the Australian government in 2021. Versions now exist in Japan (for raccoon dogs), Brazil (for golden lion tamarins), and Canada (for martens).

Reyes replied: "So we didn't build a crossing. We built a lesson."

A young wildlife ecologist named Dr. Maya Lin was tasked with monitoring the corridor. She placed heat-motion cameras on five signal posts. Over three months, she recorded 147 koala approaches. 119 ended with the koala climbing the post. 12 of those koalas were later struck by trains after descending onto the tracks.