Numbers of the world's largest primate, Grauer's gorilla, found only in the conflict-plagued Democratic Republic of the Congo (DRC), declined calamitously in 20 years according to a report co-authored by a Smithsonian scientist and published by the Wildlife Conservation Society, Flora and Fauna International and the Congolese Institute for the Conservation of Nature. From a 1998 estimate of 17,000 individuals, the population has dropped by 77 percent. Fewer than 3,800 individuals remain.