Construction crews began the process of placing the first layers of soil over the Wallis Annenberg Wildlife Crossing on Monday morning. (Al Seib/For The Times) ...

The very first layers of soil were dropped onto the Wallis Annenberg ... The nursery staff have also been growing California buckwheat, several types of sage, toyon and other plant and tree ...

as workers lay the first layers of soil on the overpass. The Wallis Annenberg Wildlife Crossing spans the 10-lane freeway in Agoura Hills and will become the largest such crossing in the world.