1“11 Facts About Endangered Species.” DoSomething.org Facts. Accessed August 18, 2017.
2"20 of the World's Weirdest Endangered Animal Species." Web Ecoist. Accessed: August 31, 2017.
3Bland, Alestair. "These Animals Might Go Extinct Because No One Wants to Eat Them." NPR. April 24, 2015. Accessed: August 31, 2017.
4Cressey, Daniel. "Cost of Conserving Global Biodiversity Set at $76 Billion." Scientific American. October 12, 2012. Accessed August 27, 2017.
5“Extinct Animal List.” Extinct Animal Facts. Accessed August 17, 2017.
6"Federal Laws to Protect Bald Eagles." U.S. Fish & Wildlife Services. April 20, 2015. Accessed August 28, 2017.
7Greenwald, Noah. “Listing Species Under The Endangered Species Act.” Center for Biological Diversity. Accessed August 17, 2017.
8———.The Extinction Crisis.” Center for Biological Diversity. Accessed August 17, 2017.
9Harmon, Katherine. "No Sex Needed: All-Female Lizards Species Cross Their Chromosomes to Make Babies." Scientific American. February 21, 2010. Accessed: September 1, 2017.
10Hartston, William. "Top 10 Facts about Extinction." Express. July 3, 2015. Accessed August 28, 2017.
11Hood, Marlowe. "The Secret Life of Dodos, Revealed." Phys Org. August 24, 2017. Accessed: September 1, 2017.
12Johnson, Bailey. "Brazilian Bikini Wax Making Crab Lice Endangered." CBS News. January 14, 2013. Accessed: September 1, 2017.
13Khalid, Waleed. "Dinosaur Facts For Kids." Animal Time. Accessed August 28, 2017.
14Kolbert, Elizabeth. The Sixth Extinction: An Unnatural History. New York: Henry Holt and Company. 2014.
15Levy, Sharon. Once and Future Giants: What Ice Age Extinctions Tell Us About the Fate of Earth’s Largest Animal. Oxford: New York, Oxford Publishing. February 17, 2011.
16Mayntz, Melissa. "Threats to Vultures." The Spruce. April 4, 2017. Accessed August 27, 2017.