The Cross River gorilla (Gorilla gorilla diehli) inhabits the dense forests of the Nigeria-Cameroon border. Distinguished by its slightly smaller size compared to other gorillas, it features a robust build, a broad chest, and a pronounced brow ridge. This critically endangered species is known for its elusive behavior and complex social structures.

Gorilla gorilla diehli, commonly known as the Cross River gorilla, is native to a small region in the border area between Nigeria and Cameroon in West Africa. It is primarily found in the forested mountainous areas of this region, specifically in the Cross River State of Nigeria and the adjoining areas in Cameroon.

The Cross River gorilla inhabits subtropical and tropical moist broadleaf forests. These forests are characterized by dense vegetation and a humid climate with significant rainfall throughout the year. The region features rugged terrain with steep hills and mountains, providing a complex and diverse environment that supports a variety of plant and animal species.

Gorilla gorilla diehli occupies a niche as a large-bodied herbivore primarily feeding on fruits, leaves, stems, and bark. They play a critical role in seed dispersal within their ecosystem, contributing to forest regeneration. The Cross River gorilla is adapted to high-altitude forest habitats and exhibits behaviors and social structures that help them navigate and survive in this challenging environment.