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    http://www.peregrinefund.org/Explore_Raptors/vultures/cacondor.html
  • Deng, Robert. "Black-naped Tern: Defense Vomiting." Bird Ecology Study Group. April 23, 2008. (Oct. 7, 2008)
    http://besgroup.talfrynature.com/2008/04/23/black-naped-tern-defense-vomiting/
  • Gross, Liza. "Switching Drugs for Livestock May Help Save Critically Endangered Asian Vultures." PLoS Biology. Vol. 4. No. 3. March 2006. (Oct. 9, 2008)
    http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1351926
  • Houston, D.C. and Cooper, J.E. "The Digestive Tract of the Whiteback Griffon Vulture and Its Role In Disease Transmission Among Wild Ungulates." Journal of Wildlife Diseases. Vol. 11. July 1975. (Oct. 7, 2008)
    http://www.jwildlifedis.org/cgi/reprint/11/3/306.pdf
  • Morrison, Dan. "Many Asian Vultures Close to Extinction, Survey Finds." National Geographic News. May 1, 2008. (Oct. 7, 2008)
    http://news.nationalgeographic.com/news/2008/05/080501-vultures-extinct.html
  • Saggese, Miguel D. et al. "First Detection of Bacillus anthracis in Feces in Free-ranging Raptors from Central Argentina." Journal of Wildlife Diseases. Vol. 43, No. 1. 2007. (Oct. 7, 2008)
    http://www.jwildlifedis.org/cgi/content/full/43/1/136
  • "Vultures." Peregrine Fund. (Oct. 7, 2008)
    http://www.peregrinefund.org/Explore_Raptors/vultures/vultmain.html