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WikiPedia: Bò_xạ_hương http://www.pc.gc.ca/eng/docs/v-g/rs-rm2003/sec4/pa... http://www.nytimes.com/2010/12/14/science/14angier... http://www.qiviut.com/store/index.cfm?target=Fiber... http://www.sciencedaily.com/releases/2005/10/05100... http://www.thelon.com/geese.htm http://www.alaska.edu/uajourney/buildings/robert-g... http://www.bucknell.edu/msw3/browse.asp?id=1420081... http://www.science.smith.edu/msi/pdf/i0076-3519-30... http://lars.uaf.edu/animals http://animaldiversity.ummz.umich.edu/site/account...