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Bibliography: How Many Endangered Species Are There In The World. (2012). Retrieved October 16, 2012, from http://howmanyarethere.net/how-many-endangered-species-are-there-in-the-world/ Habitat Destruction. (n.d). Retrieved October 16, 2012, from http://libary.thinkquest.org/08aug/00473/habitatdestruction.html Haluzan, N. (n.d). How does pollution affect animals. Retrieved October 16, 2012, from http://pollutionarticles.blogspot.com/2011/03/how-does-pollution-affect-animals.html Warshaw, A. (n.d). What animals are mostly affected by poaching. Retrieved October 16, 2012, from http://www.ehow.com/info_8420667_animals-mostly-affected-illegal-poaching.html Kaplan, M. (1995) How Human Affect Animals. Retrieved October 16, 2012, from http://worldwildlife.org/threats Nature Conservancy. (2012). Retrieved October 16, 2012, from http://www.nature.org/ Colorado River. (n.d). Retrieved November 1, 2012, from http://en.wikipedia.org/wiki/Colorado_River Haluzan, N. (2010). Endangered animals – Definition and impact. Retrieved November 1, 2012, from http://ecological-problems.blogspot.com/2012/09/endangered-animals-definition-and.html Endangered and Threatened Species. (2012). Retrieved November 1, 2012, from http://www.epa.gov/espp/coloring.especies.htm Stalcup, B. (1996). Endangered Species Opposing Viewpoints, “Extinction Is A Serious Problem”. U.S.A: Greenhaven Press, Inc. Stalcup, B. (1996). Endangered Species Opposing Viewpoints, “Extinction Is Not A Serious Problem”. U.S.A: Greenhaven Press, Inc. Stalcup, B. (1996). Endangered Species Opposing Viewpoints, “The Northern Spotted Owl Is Not Responsible for Loggers’ Unemployment.” U.S.A: Greenhaven Press, Inc. Stalcup, B. (1996). Endangered Species Opposing Viewpoint. U.S.A: Greenhaven Press, Inc.