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How city roads trap migrating fish

By Stephanie Januchowski-Hartley, Sêr Cymru Research Fellow in Environmental Sciences, Swansea University

Greater London is crisscrossed by 14,800km of public roads, each with an average width of 8m. This network accounts for 8% of the metropolitan area, and motorways and A-roads alone cross the Thames and its tributaries at least 400 times. A similar picture is seen in cities across the world.

You’ve heard of, and maybe seen, hedgehogs and…

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