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The European beaver was hunted to extinction for its fur, meat and the aromatic secretions from sacs near its anal glands. Now it is coming back throughout Europe , either naturally or by being introduced, as here in the UK. Wherever they settle they transform the landscape by building dams and channels and create a landscape of pools and watercourses that hold back flood water, pollution and silt from entering the main rivers. In these times of severe weather events and flooding beavers are doing for free what landscape engineers would do at great cost. Viewing nature in terms of the services it provides, or evaluating nature in financial terms, is a growing movement in conservation. Nature can be seen on balance sheets and hopefully respected for all that it gives us for free. But there is concern that monetising nature leaves it open to the ruthless world of finance and trading and diverts attention away from the real aims of conservation.