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Chimpanzee Population Change (U.S.). National Geographic, National Geographic Society, 28 Feb. 2018, blog.nationalgeographic.org/2018/02/28/a-changing-landscape-for-chimpanzees-in-america/. Accessed 23 Oct. 2019.
Conciatore, Jacqueline. "The Endangered Bonobo: Africa's Forgotten Ape." African Wildlife Foundation, 13 July 2018, www.awf.org/blog/endangered-bonobo-africas-forgotten-ape. Accessed 22 Oct. 2019.
"Critical Protection for Borneo's Rainforest." Rainforest Trust, 2019, www.rainforesttrust.org/projects/saving-a-stronghold-for-the-critically-endangered-bornean-orangutan-2/. Accessed 22 Oct. 2019.
Davenport, Tim. Mom Kipunji and Child. New England Primate Conservancy, 2019, www.neprimateconservancy.org/kipunji.html. Accessed 23 Oct. 2019.
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"Endangered Animals." Ducksters, Technological Solutions, www.ducksters.com/animals/endangered_animals.php. Accessed 22 Oct. 2019.
"Endangered White-Headed Langurs Enjoying Springtime." CGTN, 17 Mar. 2019, news.cgtn.com/news/3d3d514e7845444e33457a6333566d54/index.html. Accessed 23 Oct. 2019.
"ESA Basics." U.S. Fish & Wildlife Service, U. S. Fish and Wildlife Service Endangered Species Program, Jan. 2013, www.fws.gov/endangered/esa-library/pdf/ESA_basics.pdf. Accessed 5 Nov. 2019.
"The Extinction Crisis." Center for Biological Diversity, www.biologicaldiversity.org/programs/biodiversity/elements_of_biodiversity/extinction_crisis/. Accessed 24 Oct. 2019.
Freedman, Ethan. "New Reserve Protects Bonobos in Congo Rain Forest." Rain Forest Trust, 29 May 2019, www.rainforesttrust.org/new-reserve-protects-bonobos-in-congo-rainforest/. Accessed 22 Oct. 2019.
Freitas, James. "Kipunji." New England Primate Conservancy, www.neprimateconservancy.org/kipunji.html.
"Halting Threats to Kipunji and Abbott's Duiker in the Southern Highlands of Tanzania." Save Our Species, IUCN SOS, www.saveourspecies.org/projects/primates/halting-threats-kipunji-and-abbotts-duiker-southern-highlands-tanzania. Accessed 23 Oct. 2019.
Hanging Bornean Orangutan. 2019. Study.com, 2019, study.com/academy/lesson/why-is-the-bornean-orangutan-endangered.html. Accessed 24 Oct. 2019.
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"How Does a Species Become Endangered?" Wonderopolis, 2019, www.wonderopolis.org/wonder/how-does-a-species-become-endangered. Accessed 24 Oct. 2019.
"How to Help Biodiversty." Ology, www.amnh.org/explore/ology/biodiversity/how-to-help-biodiversity2. Accessed 22 Oct. 2019.
Laughing Bonobo. 2019. San Diego Animals & Plants, San Diego Zoo Global, 2019, animals.sandiegozoo.org/animals/bonobo. Accessed 24 Oct. 2019.
Laurance, W. F. Deforestation. USA Today, 2017, www.usatoday.com/story/tech/sciencefair/2017/01/18/primates-apes-monkeys-extinction/96724398/. Accessed 30 Oct. 2019.
Leonard, Neahga. Cat Ba Langur Peeking through the Leaves. 2019. New England Primate Conservancy, 2019, www.neprimateconservancy.org/cat-ba-langur.html. Accessed 24 Oct. 2019.
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Mccall, Matt. "Chimpanzees Deemed Endangered by U.S.—What's It Mean?" National Geographic, National Geographic Society, 12 June 2015, www.nationalgeographic.com/news/2015/06/150612-chimpanzees-animals-endangered-science-nation/#close. Accessed 22 Oct. 2019.
"Mountain Gorilla." Animal Fact Guide, 2019, animalfactguide.com/animal-facts/mountain-gorilla/. Accessed 23 Oct. 2019.
Mountain Gorilla. 2019. Animal Fact Guide, 2019, animalfactguide.com/animal-facts/mountain-gorilla/. Accessed 24 Oct. 2019.
"Mountain Gorilla." World Wildlife Foundation, 2019, wwf.panda.org/knowledge_hub/endangered_species/great_apes/gorillas/mountain_gorilla/. Accessed 23 Oct. 2019.
Mountain Gorilla and Child. 2019. Animal Fact Guide, 2019, animalfactguide.com/animal-facts/mountain-gorilla/. Accessed 24 Oct. 2019.
Mountain Gorillas Killed. July 2007. World Wildlife Foundation, Altor IGCP Goma, 2019, wwf.panda.org/knowledge_hub/endangered_species/great_apes/gorillas/mountain_gorilla/#help. Accessed 23 Oct. 2019.
Nomascus Gabreillae. Primate Info Net, University of Wisconsin, pin.primate.wisc.edu/factsheets/links/nomascus. Accessed 5 Nov. 2019.
"Nomascus Gibbon." A.P.E.S. Portal, apesportal.eva.mpg.de/status/species/gibbon/nomascus. Accessed 22 Oct. 2019.
Olson, Scott. Orangutan. Independent, 15 Feb. 2018, www.independent.co.uk/environment/orangutan-population-drop-borneo-hunting-poaching-habitat-loss-rainforests-a8212706.html. Accessed 25 Oct. 2019.
Nomascus Gibbon. Wikipedia, 16 Feb. 2019, en.wikipedia.org/wiki/Southern_white-cheeked_gibbon. Accessed 5 Nov. 2019.
"Orangutan Facts." The Orangutan Project, 2019, www.orangutan.org.au/about-orangutans/orangutan-facts/. Accessed 22 Oct. 2019.
Pileated Gibbon. Animal Life Expectancy, www.worldlifeexpectancy.com/mammal-life-expectancy-pileated-gibbon. Accessed 5 Nov. 2019.
"Pileated Gibbon." Thai National Parks, 2019, www.thainationalparks.com/species/pileated-gibbon. Accessed 22 Oct. 2019.
"Protecting Endangered Species." The National Wildlife Federation, 2019, www.nwf.org/Our-Work/Wildlife-Conservation/Endangered-Species. Accessed 24 Oct. 2019.
Rungwecebus. CNN, 26 Apr. 2016, www.cnn.com/2016/04/26/africa/kipunji-monkey-tanzania/index.html. Accessed 5 Nov. 2019.
"Recovery of Endangered and Threatened Species." National Oceanic and Atmospheric Administration, 25 June 2017, www.fisheries.noaa.gov/insight/recovery-endangered-and-threatened-species#how_successful_is_the_endangered_species_act. Accessed 24 Oct. 2019.
Robb, Amanda. "Why Is the Bornean Orangutan Endangered?" Study.com, 2019, study.com/academy/lesson/why-is-the-bornean-orangutan-endangered.html. Accessed 22 Oct. 2019.
Siamang. https://animals.sandiegozoo.org/animals/siamang, San Diego Zoo Global, 2019, animals.sandiegozoo.org/animals/siamang. Accessed 23 Oct. 2019.
Siamang. Smithsonian's National Zoo & Conservation Biology Institute, nationalzoo.si.edu/animals/siamang. Accessed 5 Nov. 2019.
"Siamang." San Diego Zoo, San Diego Zoo Global, 2019, animals.sandiegozoo.org/animals/siamang. Accessed 22 Oct. 2019.
Stogsdill, Dennis. Gorilla. WWF, www.wwf.org.uk/updates/5-facts-about-mountain-gorillas. Accessed 5 Nov. 2019.
Teldo Zoo. Orangutan. WBNS, www.10tv.com/article/volunteer-toledo-zoo-loses-thumb-during-encounter-orangutan. Accessed 5 Nov. 2019.
USA Today. 18 Jan. 2017, www.usatoday.com/story/tech/sciencefair/2017/01/18/primates-apes-monkeys-extinction/96724398/. Accessed 30 Oct. 2019.
Very long arms help this acrobatic species to move quickly through trees. About Animals, www.aboutanimals.com/mammal/siamang/. Accessed 23 Oct. 2019.
"What is the difference between a threatened and endangered species?" National Ocean Service, oceanservice.noaa.gov/facts/endangered.html. Accessed 22 Oct. 2019.
"White-Headed Langur." Earth's Endangered Creatures, 19 May 2017, www.earthsendangered.com/profile.asp?gr=&view=c&ID=3&sp=4298. Accessed 24 Oct. 2019.
"Why are there so many endangered animals these days?" Ology, American Museum of Natural, www.amnh.org/explore/ology/earth/ask-a-scientist-about-our-environment/why-are-so-many-animals-endangered. Accessed 23 Oct. 2019.
Worland, Justin. "Captive Chimps to Receive Endangered Species Protections." Time, Time USA, 12 June 2015, time.com/3919270/chimpanzee-endangered-species/. Accessed 22 Oct. 2019.
Young Bonobos at Play. 2019. San Diego Animals & Plants, San Diego Zoo Global, 2019, animals.sandiegozoo.org/animals/bonobo. Accessed 24 Oct. 2019.