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Hunting and Wildlife Trade. (n.d.). . Retrieved May 15, 2014, from http://www.wcs.org/conservation-challenges/natural-resource-use/hunting-and-wildlife-trade.aspx
McKie, R. (2012, September 23). Humans hunted for meat 2 million years ago. The Observer. Retrieved May 15, 2014, from http://www.theguardian.com/science/2012/sep/23/human-hunting-evolution-2million-years
THEIBAULT, J., Steinberg, R., MACHALEK, R., West's Encyclopedia of American Law. 2005., American Eras. 1997., The Columbia Encyclopedia, 6th ed.. 2013., et al. (2004, January 1). Hunting. Encyclopedia.com. Retrieved May 15, 2014, from http://www.encyclopedia.com/topic/hunting.aspx
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Mass Extinction, Mass Die-Off Information, Prehistoric Facts -- National Geographic. (n.d.). National Geographic. Retrieved May 15, 2014, from http://science.nationalgeographic.com/science/prehistoric-world/mass-extinction/
Brown, R. (n.d.). The History of Wildlife Conservation and Research in the United States – and Implications for the Future . . Retrieved May 15, 2014, from http://cnr.ncsu.edu/fer/directory/documents/Article-HistoryofWildlifeResearch.pdf
Illinois County Distribution. (n.d.). USFWS: Illinois Threatened and Endangered Species. Retrieved May 16, 2014, from http://www.fws.gov/midwest/endangered/lists/illinois-cty.html
Species Profile for Piping Plover (Charadrius melodus). (2014, May 16). Species Profile for Piping Plover (Charadrius melodus). Retrieved May 16, 2014, from http://ecos.fws.gov/speciesProfile/profile/speciesProfile.action?spcode=B079
Richardson, M. (2005, October 17). Northern sportive lemur (Lepilemur septentrionalis). Northern sportive lemur photo. Retrieved May 16, 2014, from http://www.arkive.org/northern-sportive-lemur/lepilemur-septentrionalis/image-G132944.html
restoring nature. (n.d.). . Retrieved May 19, 2014, from http://www.chicagowilderness.org/what-we-do/restoring-nature-to-health/
Red Pandas, Red Panda Pictures, Red Panda Facts - National Geographic. (n.d.). National Geographic. Retrieved May 20, 2014, from http://animals.nationalgeographic.com/animals/mammals/red-panda/
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Thylacine, or Tasmanian Tiger, Thylacinus cynocephalus. (n.d.). Parks & Wildlife Service. Retrieved May 20, 2014, from http://www.parks.tas.gov.au/indeX.aspX?base=4765
http://www.eoearth.org/topics/view/51cbfc78f702fc2ba8129e70/
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