Beavers are becoming a problem for some of the watershed groups on PEI and the CBC did a story about the issue. It was well done and the video is available on the CBC website. Here is the link. Note, it requires Real Player.

http://www.cbc.ca/pei/media/video/pe-beaverdams.ram

Here is a good description of the beaver, at the PEI gov website.

http://www.gov.pe.ca/envengfor/index.php3?number=1010070&lang=E