Animals bridges, which may also be known as ecoducts or wildlife crossings, are structures that allow animals to safely cross human-made barriers like highways. A wildlife crossing is the broadest term and can include: underpass tunnels, viaducts, overpasses and bridges, amphibian tunnels, fish ladders, culvets and green roofs. When we are going to have one in Malaysia to avoid road kills.

http://twistedsifter.com/2012/07/animal-bridges-around-the-world/