How creating wildlife crossings can help reindeer, bears – and even crabs

A wildlife overpass in Banff national park, in the Canadian Rockies. Photograph: Ross MacDonald/Banff National Park

Red crabs on Christmas Island climb a bridge designed for their protection. Photograph: Chris Bray

 Sweden’s announcement this week that it is to build a series of animal bridges is the latest in global efforts to help wildlife navigate busy roads.

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