1. Millennium Ecosystem Assessment, Ecosystems and Human Well-Being: Biodiversity Synthesis (World Resources Institute, Washington, DC, 2005).
2. IUCN, 2006 IUCN Red List of Threatened Species (IUCN, Gland, Switzerland, 2006)available at http://www.iucnredlist.org/.
3. Butchart S. H. M., Stattersfield A. J., Collar N. J., Oryx40, 266 (2006).
4. Gaston K. J., Ed. Biodiversity—A Biology of Numbers and Difference (Blackwell Science, Oxford, 1996).
5. The Convention on Biological Diversity's 2010 Target