Equatorial Guinea is a small but ecologically rich country located on the west coast of Central Africa. It is home to a remarkable diversity of wildlife, particularly primates. The country's tropical rainforests, which are mainly found in the region of Río Muni and on the island of Bioko, offer a haven for various primate species, some of which are critically endangered.

One of the most notable primates in Equatorial Guinea is the Bioko drill, a distinct subspecies of the drill monkey primarily found on Bioko Island. This large, terrestrial monkey is closely related to the mandrill and is easily identifiable by its dark face, prominent brow ridges, and short tail. Bioko drills are social animals that live in groups and primarily feed on fruits. Unfortunately, their numbers are rapidly dwindling due to habitat loss and hunting, making concerted conservation efforts vital for their survival.

Mandrills are particularly known for their striking facial colouration, with males displaying vibrant red and blue hues on their noses and rumps, which become more intense during the mating season. Mandrills are among the largest species of monkey and are closely related to baboons, though they possess unique traits that distinguish them. Mandrills inhabit dense, humid forests, living in large social groups known as "hordes", which can number in the hundreds. These groups are led by dominant males and have a highly hierarchical structure. Mandrills are known for being shy and elusive, making sightings in the wild rare. Conservation efforts are essential to protect mandrill populations, as they face threats from habitat loss and hunting.

The Moustached Guenon, also referred to as the moustached monkey, is a distinctive primate found in Equatorial Guinea. It is easily recognised by its striking appearance, featuring a prominent white or light-coloured moustache that extends from its nose to the corners of its mouth, which is how it gets its name. Its fur is usually a blend of grey and olive-green, with a darker face and a lighter underbelly. This species also has a relatively long tail that it uses for balance as it navigates through the trees.

Another significant primate species on Bioko Island is the Bioko Red Colobus. This monkey is characterised by its reddish-brown coat and long, slender limbs. Red colobus monkeys are arboreal and mainly feed on leaves, flowers, and fruits. Like the Bioko drill, the Bioko red colobus is critically endangered, facing severe threats from deforestation and hunting. Bioko Island remains one of the few remaining habitats for this species, underscoring the need for dedicated conservation initiatives.

The Black Colobus, also known as the satanic colobus, is another important primate species found in Equatorial Guinea, particularly in the rainforests of Río Muni. This monkey is distinguished by its all-black fur and long tail, which aids in balance as it navigates through the trees. Black colobus monkeys are primarily folivorous, subsisting on leaves, seeds, and fruits. They live in social groups that vary in size, and while they are not currently classified as critically endangered, they are vulnerable due to habitat destruction and hunting.

Another primate native to Bioko Island is the Crested Mona Monkey, or Bioko mona monkey. It is recognised by its white throat, golden back, and expressive face adorned with distinct cheek whiskers. Crested mona monkeys are highly adaptable and inhabit a range of environments from primary rainforests to secondary forests and plantations. Their diet is omnivorous, including fruits, seeds, leaves, and insects. The crested mona is one of several guenon species in Equatorial Guinea, including the crowned monkey and the moustached monkey, all known for their vibrant and varied facial patterns.

On the mainland in Río Muni, the Western Lowland Gorilla can also be found, although it is increasingly rare. This subspecies is the smallest of the gorillas and is renowned for its strong social structures and complex behaviours. Western lowland gorillas are critically endangered due to poaching, disease, and habitat loss, making it crucial to protect their remaining habitats within Equatorial Guinea’s protected areas.

The common Chimpanzee, another primate inhabiting the mainland forests of Río Muni, shares many behavioural and genetic traits with humans. Chimpanzees are highly intelligent, known for their use of tools and complex social interactions. However, like gorillas, they are endangered due to threats from hunting, habitat destruction, and disease.

The primates of Equatorial Guinea face significant threats from deforestation driven by logging and agricultural expansion, as well as from hunting, often for bushmeat. Conservation efforts are essential to safeguard these species, many of which are endemic or have small, isolated populations. Protected areas such as Pico Basilé National Park on Bioko Island and Monte Alén National Park on the mainland play a crucial role in preserving these primates’ habitats. Additionally, efforts to reduce hunting and promote sustainable practices within local communities are vital for their continued survival.

These primates are not only integral to the country’s ecosystems but also hold significant cultural and ecological value. Ensuring their conservation amidst growing environmental pressures is essential for maintaining the region’s biodiversity and ecological balance.