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WikiPedia: Đập_hải_ly http://www.geostrategis.com/p_beavers-longestdam.h... http://www.grindtv.com/outdoor/excursions/post/exp... http://www.mnn.com/earth-matters/wilderness-resour... http://www.sciencedaily.com/releases/2007/01/07011... http://www.seeker.com/largest-beaver-dam-seen-from... http://www.wildlifeextra.com/go/news/beaver-boost.... http://www.youtube.com/watch?v=DSjQyB8F4JI http://etal.usu.edu/ICRRR/Beaver/Beaver%20dam%20ef... http://www.beaverdam.info/ http://fohn.net/beaver-pictures-facts/beaver-dams....