"Gorillas on Thin Ice". United Nations Environment Programme. 15 January 2009. Archived from the original on 18 May 2016. Retrieved 19 May 2010.: "The Eastern Lowland Gorilla population in the DRC has plummeted dramatically over the last 10 years, with probably only about 5,000 of the formerly 17,000 animals remaining."
"Gorillas on Thin Ice". United Nations Environment Programme. 15 January 2009. Archived from the original on 18 May 2016. Retrieved 19 May 2010.: "The Eastern Lowland Gorilla population in the DRC has plummeted dramatically over the last 10 years, with probably only about 5,000 of the formerly 17,000 animals remaining."