Another of the primates in danger of extinction is the western gorilla. It is an ape and not technically a monkey, but it does fall under the infraorder of Simiiformes. It is typical of Africa, especially countries such as Angola, Cameroon, Congo and Nigeria. It is considered critically endangered especially due to the reduction of the subspecies of the western lowland gorilla .

Various factors have caused the dramatic situation this species now faces. The main issue is poaching. This is for various purposes, including using them for the consumption of their meat, an action which is thoroughly unsustainable. The Ebola virus has also caused a significant decline, as well as the damage to the habitat and the consequences of climate change.