Cool question, I saw something about this just yesterday on TV. Living bridges are formed from tree roots and are grown to span rivers or valleys from the Ficus elastica tree (also known as the rubber fig). The War-Khasis tribe in India create bridges like these by hollowing out a tree trunk sliced in half to provide a support and guidance system for the roots. The roots then grow along the tree trunk and can over time, make a very strong foot bridge. See below for an example.[img_assist|nid=155573|title=bridge|desc=|link=none|align=left|width=640|height=403]
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