Beavers build 850-metre dam in northern Alberta

Canada has its own record-setting structure. Beavers in Wood Buffalo National Park in northern Alberta have been busy building what scientists believe is the world’s largest beaver dam.
The structure is 850 metres long and located among the Birch Mountains, about just south of Lac Clair.
CBC reports that an Ottawa ecologist, Jean Thie, who is executive director of the Canadian Institute of Geomatics, discovered the beaver dam while scanning satellite images for signs of climate change.
Thie said that the longest beaver dam that had been previously reported was a 652-metre structure in Three Forks, Montana.