Los Angeles to build world's largest wildlife bridge across 10-lane freeway

An $87m corridor will extend over Highway 101 to reconnect the ecosystem and possibly save mountain lions from extinction

Engineers in southern California are hard at work designing the biggest wildlife corridor in the world, to extend over US Highway 101 to the north-west of Los Angeles.

The corridor will connect different parts of the Santa Monica Mountain chain, which is crucial to the future of mountain lions - but it will help other species as well. The $87m bridge has entered its final design phase and is on track to open in 2023.