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"Biotic Factors." The Tropical Grassland Savanna. n.d. Web. 10 Mar. 2013. <http://tropicalgrassland.wordpress.com>.
"Bushmen." Survival International. Survival International Charitable Trust, n.d. Web. 10 Mar. 2013. <http://www.survivalinternational.org>.
"Commensalism." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 10 Mar. 2013. <http://www.britannica.com>.
Edwards, W. J. "Population Limiting Factors." Nature.com. Nature Publishing Group, n.d. Web. 10 Mar. 2013. <http://www.nature.com>.
Google Images (2013). Google.com
"Mutualism." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 10 Mar. 2013. <http://www.britannica.com>.
"Savanna Biome." Animal Facts and Information RSS. BioExpedtion, n.d. Web. 10 Mar. 2013.<http://bioexpedition.com>.
Stevens, Alison. "Predation, Herbivory, and Parasitism." Nature.com. Nature Publishing Group, n.d. Web. 10 Mar. 2013. <http://www.nature.com>.