Western Gorilla (Gorilla gorilla) silverback skull with butterfly (Belenois theszi). Gorilla diedd from the Ebola Virus, which killed 128 people in the region in 2003 and in 2005 killed 95% of the Gorilla population in the Odzala-Kokoua National Park. Odzala Kokoua NP, Republic of Congo, June 2004.