For mountain lions living in Los Angeles—and yes, mountain lions do manage to survive in the second-largest city in the U.S.—the 101 freeway is a major barrier to their daily routines. The same is true for other wildlife. But plans to build a massive wildlife crossing over a 10-lane stretch of the freeway just north of the city are now in the final phase of design and engineering. The project will be the largest bridge of its kind in the world.
“We know from science what’s going on there, and it’s a little deeper than just that the animals are getting hit by cars,” says Beth Pratt of the National Wildlife Federation, one of several partner organizations working on the project.