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There are two species of gorilla, the western gorilla (''Gorilla gorilla'') and the eastern gorilla (''Gorilla beringei''). The western gorilla consists of two recognized subspecies: the Cross River gorilla (''Gorilla gorilla diehli'') and the western lowland gorilla (''Gorilla gorilla gorilla''). The Cross River gorilla is classified as Critically Endangered (C2a(i) according to the IUCN (2008) Red List (Bergl et al. 2016) meaning that it is considered to be facing an extremely high risk of extinction in the wild.  

There are two species of gorilla, the western gorilla (''Gorilla gorilla'') and the eastern gorilla (''Gorilla beringei''). The western gorilla consists of two recognized subspecies: the Cross River gorilla (''Gorilla gorilla diehli'') and the western lowland gorilla (''Gorilla gorilla gorilla''). The Cross River gorilla is classified as Critically Endangered according to the IUCN (2008) Red List (Bergl et al. 2016) meaning that it is considered to be facing an extremely high risk of extinction in the wild.  

The range of the Cross River gorilla is restricted to the hilly rainforest region along the Nigeria-Cameroon border (Dunn et al. 2014). Separated from the nearest population of western lowland gorilla to the south by approximately 200 km, the subspecies is scattered across a surface area of approximately 12,000 km² (Dunn et al. 2014). About one-third of Cross River gorilla landscape occurs in three areas of Cross River State, [[Nigeria]] (the [[Afi Mountain Wildlife Sanctuary]], the Mbe Mountains, and the Okwangwo Division of Cross River National Park). In [[Cameroon]], there are five key areas for Cross River gorillas, all located within Cameroon’s Southwest Region ([[Takamanda National Park]] and adjacent Mowambi Hills, [[Mone River Forest Reserve]], the Mbulu-Oko forest, and Bechati-Fossimondi-Besali forest) except the Kagwene Gorilla Sanctuary which extends a few kilometers into the Northwest Region (Bergl et al. 2012; Dunn et al. 2014).  

The range of the Cross River gorilla is restricted to the hilly rainforest region along the Nigeria-Cameroon border (Dunn et al. 2014). Separated from the nearest population of western lowland gorilla to the south by approximately 200 km, the subspecies is scattered across a surface area of approximately 12,000 km² (Dunn et al. 2014). About one-third of Cross River gorilla landscape occurs in three areas of Cross River State, [[Nigeria]] (the [[Afi Mountain Wildlife Sanctuary]], the Mbe Mountains, and the Okwangwo Division of Cross River National Park). In [[Cameroon]], there are five key areas for Cross River gorillas, all located within Cameroon’s Southwest Region ([[Takamanda National Park]] and adjacent Mowambi Hills, [[Mone River Forest Reserve]], the Mbulu-Oko forest, and Bechati-Fossimondi-Besali forest) except the Kagwene Gorilla Sanctuary which extends a few kilometers into the Northwest Region (Bergl et al. 2012; Dunn et al. 2014).