The Wallis Annenberg Wildlife Crossing, in the United States, is set to be the world's largest wildlife bridge. The animal crossing, currently under construction, will connect the Santa Monica Mountains and Simi Hills over the 101 Freeway, a very busy road in Agoura Hills, California.

The project, with an estimated cost of $114million (£85million), is expected to be completed at the end of 2026. Spanning 10 lanes of traffic, the wildlife bridge will enable coyotes, cougars, deer, mountain lions and butterflies to cross safely. The Wallis Annenberg Wildlife Crossing said: "Of all the area roads, multiple research and planning efforts have identified the 101 Freeway as the most significant barrier to the ecological health of the region.

"This crossing will re-connect an entire ecosystem that has long been fragmented by this almost impenetrable obstacle for wildlife.

"By building a wildlife crossing over the 10 lanes of freeway and an access road - in the last 1,600 feet in the area that possesses protected land north and south of the 101.

"This project will re-establish ecological connectivity for a multitude of native plant and animal species in the Santa Monica Mountains ecosystem."

Rorie Skei, Chief Deputy Director of Santa Monica Mountains Conservancy, said: "The Santa Monica Mountains Conservancy & MRCA are excited to enter this last critical phase in making a safe passage for wildlife across the 101 and delivering on our 30 plus years of work to preserve habitat linkages."

Other wildlife bridges include the new Greenland overpass, in Colorado, andthe Gloucestershire Way bridge, in the UK, expected to be completed by 2027.

The Gloucestershire Way bridge will be the UK's largest wildlife crossing, aiming to conserve the Cotswolds' nature and wildlife.