In 1974, an Australian ranger proposed turning a service bridge into a wildlife corridor; 52 years later, it opened over a motorway carrying 40,000 vehicles a day, reconnecting two national parks

• In 1974, Royal National Park ranger Bob Crombie suggested using Cawleys Bridge to help animals safely move between areas of bushland separated by a major road.
• In 2026, the bridge was transformed into a dedicated wildlife corridor above the Princes Motorway in southern Sydney.