Note: There is not in fact any evidence that any dams lasted centuries... rather, there is evidence that for periods lasting centuries the same locations are identified by beavers as being good places to build dams.

Reminds me of the story of the "World's largest Beaver Dam" that "can be seen from space". Impressive structure

http://www.telegraph.co.uk/news/worldnews/northamerica/canad...

I wonder if beavers ever take a break? Are they always "busy as beavers"? Do the women beavers push their men to dam a bigger pond?