Mammals diurnal

Campbell's Monkey

Cercopithecus campbelli

A vocal and vibrant resident of the West African canopy, Campbell's Monkey is a master of communication. Recognizable by its elegant white brow, this social primate is a delight to discover for anyone living near the forest's edge.

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Quick Identification

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Size

Head and body length of 35-55 cm (14-22 in); tail length up to 75 cm (30 in); weight ranges from 2.2-4.5 kg (5-10 lbs), with males significantly larger than females.

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Colors

Olive-green to yellowish-brown speckled fur on the back, whitish underparts, and a distinct white horizontal band across the forehead. The face is dark with pinkish skin around the mouth.

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Key Features

Distinctive white 'diadem' or brow band across the forehead
Extra-long dark tail used for balance in the canopy
Yellow-olive grizzled coat that blends into forest foliage
White or light-colored 'beard' and cheek whiskers

When You’ll See Them

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Activity pattern diurnal

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Peak hours 6:00 AM - 10:00 AM and 3:00 PM - 6:00 PM

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Season Year-round, with increased visibility during local fruit ripening seasons (e.g., mango or papaya harvests).

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Diet Omnivorous with a heavy preference for fruit. They also forage for seeds, leaves, and flowers, and will supplement their diet with insects and small invertebrates found in the bark of trees.

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Habitat Primary and secondary rainforests, gallery forests, mangroves, and increasingly found in forest edges and farm bush areas near human habitation.

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Behavior

Campbell's Monkeys are highly social primates that typically live in small family groups consisting of one dominant male and several females with their offspring. They are famous among researchers for their sophisticated communication system; they use a complex series of 'booms' and 'krak' calls that function almost like human syntax to warn of specific predators or coordinate group movement.

While primarily arboreal, these monkeys are incredibly adaptable and are often seen near human settlements where forest edges meet agricultural land. They are active during the day, spending much of their time in the middle and lower layers of the forest canopy. They are known to form 'interspecific' associations, often traveling alongside other species like Diana monkeys for extra protection against predators.

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Camera Tips

To capture high-quality footage of Campbell's Monkey, avoid placing your camera on the ground. These guenons prefer the middle canopy, so mounting your camera between 5 and 10 feet up a sturdy trunk is ideal. Angle the lens slightly downward toward a known travel path or a branch that bridges a gap between trees. If you have fruit-bearing trees like mango, citrus, or papaya on your property, focus your efforts there, as these are natural magnets for a hungry troop.

Since these monkeys move quickly through the branches, set your camera to a fast trigger speed (0.3 seconds or less) and use a multi-shot 'burst' mode. This increases your chances of getting a clear facial shot rather than just a blurry tail. If your camera supports high-definition video, 20-30 second clips are preferable to photos, as they allow you to observe their fascinating social grooming behaviors and listen for their unique vocalizations.

Timing is everything with this species. They are most active in the 'golden hours' shortly after dawn and before dusk. If the area is particularly hot, they may descend closer to the ground to find water, so placing a camera near a shaded forest stream or a garden water feature can yield excellent results. Be mindful of the sun; backlighting through the canopy can wash out the details of their olive fur, so try to position the camera with the sun at its back.

Similar Species

Species that look similar or are commonly confused with Campbell's Monkey.

Lowe's Mona Monkey

Very closely related but lacks the slightly more vibrant olive-yellow speckling of Campbell's and lives primarily east of the Cavally River.

Mona Monkey

Features more prominent white hip patches and a reddish-brown back compared to the olive-green back of the Campbell's Monkey.

Diana Monkey

Much more striking black and white contrast with a white beard and a bright orange patch on the inner thighs.

Frequently Asked Questions

Campbell's Monkeys are diurnal, meaning they are active during daylight. Their peak activity occurs in the early morning and late afternoon when they move between sleeping sites and foraging grounds.

The best way to attract them is by maintaining native fruiting trees like mango, guava, or oil palms. They are drawn to gardens that offer a safe corridor of trees and a reliable source of fresh water.

Their diet is primarily frugivorous, consisting of a wide variety of wild and cultivated fruits. They also eat seeds, young leaves, and a significant amount of insects, which provide essential protein.

Yes, they are remarkably adaptable. While they prefer forests, they are frequently found in 'farm bush'—the transition zones between wild forests and suburban gardens or agricultural plantations.

While very similar, Campbell's Monkeys generally have a more yellowish-green tint to their coat compared to the browner Lowe's Monkey, and their geographic range is primarily further west (Sierra Leone to Ghana).

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