These Incredible Man-Made Highways Are Built Just for Animals

Humans don't exactly have a stellar record when it comes to environmental stewardship, but that doesn't mean we aren't trying. Numerous projects around the world are working to rebuild lost habitats, protect vital wildlife highways, and regenerate lost populations. Here are a few man-made structures built on behalf of… » 3/16/14 9:00am 3/16/14 9:00am