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In 2016 a study led by the Wildlife Conservation Society estimated the Grauer's gorilla population to be at roughly 3,800, a decline of almost 80 percent since the last major survey conducted two decades earlier.

Agriculture has caused gray partridges in the United Kingdom to plummet, while illegal hunting and mining have driven down the Grauer’s gorilla population in the Congo by 87 percent.

Grauer's gorilla populations have dropped by 80 percent in 20 years.

In the DRC, hunters working around the tin, gold and diamond mine industry are the greatest threat to the region’s Grauer’s gorilla.

Several primate species only have a few thousand animals that remain alive, including the ring-tailed lemur, Udzunga red colobus monkey, Yunnan snub-nosed monkey, white-headed langur and Grauer’s gorilla.