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This woodland construction is the world's biggest beaver dam,which is about 2,790 feet in length and more than twice the length of the Hoover Dam,and can be seen from space. The mammals use trees,mud and stones to make a type of moat (where they can use their swimming skills to evade any meat-eating animals.The families of beavers live in lodges on the dams and spend their days adding to and repairing the in credible structures.While beaver dams range from a few metres to about 100 metres (330 ft)in length,this one has surprised bi- ologists because of its length.The dam is located on the southern edge of Wood Buffalo National Park in northern Alberta,Cana- da.It is thought that several beaver families joined forces to cre-