'World's biggest' beaver dam discovered in Canadian park
Posted: Mon May 10, 2010 2:39 pm
An ecologist in Canada has located a huge beaver dam stretching 850m (2,788ft) using pictures filmed from outer space.
Using past images and park aerial photography, he estimated that the beavers started building it in the 1970s.
Using past images and park aerial photography, he estimated that the beavers started building it in the 1970s.