The World's Largest Wildlife Crossing

When it opens in December, the Wallis Annenberg Wildlife Crossing will be the largest in the world. Stretched over a ten-lane freeway, it is meant to save the California Mountain Lion population, and to help numerous other species in the area whose habitat has become fragmented by the road. It could also serve as a model for similar sites around the world, as in the past, highways of a certain size have been viewed as too big to host wildlife crossing. But, will the project work? We take a look at what is needed to build a crossing of this size, whether crossings really address the root of the problem, and what the existing scientific literature says about how effective wildlife crossings can be.