Mammals diurnal

Diana guenon

Cercopithecus diana

Meet the elegant acrobat of the West African canopy, named for the goddess of the hunt. With its striking white brow and sophisticated social life, the Diana guenon is one of the forest's most charismatic residents.

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Quick Identification

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Size

Body length 40-55 cm (16-22 in); Tail length 50-75 cm (20-30 in); Weight 2-5 kg (4.4-11 lbs)

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Colors

Black and dark grey body with a bright white throat, chest, and browband; distinctive orange or chestnut patch on the inner thighs.

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Key Features

Crescent-shaped white browband resembling a bow
Long white 'beard' and ruff around the face
Slender black tail significantly longer than the body
Striking chestnut-colored patch on the back of the thighs

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

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Diet Primarily frugivorous, focusing on ripe forest fruits, but they supplement their diet with insects, seeds, and young leaves for protein.

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Habitat Primary rainforests and old-growth high canopy forests.

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Behavior

Diana guenons are highly social and intelligent primates that live in stable groups of 15 to 30 individuals. These groups are typically matrilineal, centered around a community of related females and their offspring, led by a single dominant male. They are famous among biologists for their sophisticated vocal communication; they use specific alarm calls to distinguish between different types of predators, such as crowned eagles or leopards, allowing the group to respond with the appropriate escape tactic.

Strictly arboreal, these monkeys are the acrobats of the high canopy. They rarely descend to the forest floor, preferring to forage, socialized, and sleep high above the ground. While they are generally shy and wary of human contact, they are incredibly active and playful within their social groups. Their presence is often revealed by the sound of crashing branches as they make daring leaps between trees or their loud, resonant alarm calls that echo through the rainforest.

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Camera Tips

Capturing the Diana guenon on a trail camera requires thinking vertically. Because these monkeys are almost exclusively canopy-dwellers, a ground-level camera will likely only capture shadows or the occasional accidental descent. For the best results, you must secure your camera high in the trees—ideally 20 to 50 feet up—along 'arboreal highways.' These are the predictable paths of overlapping branches that monkeys use to travel between feeding sites.

When mounting your camera at height, use a heavy-duty strap and consider a solar-panel attachment if possible, as climbing to change batteries can be difficult and disruptive. Angle the lens slightly downward toward a sturdy horizontal branch or a fork in a tree where the monkeys are likely to pause. If you are monitoring a specific fruiting tree, such as a wild fig, position the camera 10-15 feet away from the ripening fruit to capture the full range of social behavior as the group feeds.

Because Diana guenons are fast-moving and agile, camera settings are critical. Set your trigger speed to the fastest possible setting (0.2 seconds or less) and use a high-speed 'burst' mode to take 3-5 photos per trigger. This increases your chances of getting a clear shot of their distinctive facial markings rather than just a blur of a tail. High-definition video with audio is also highly recommended, as their complex vocalizations are as much a part of their identity as their physical appearance.

Avoid using artificial lures or food scraps, which can habituate these sensitive primates to human presence and expose them to risk. Instead, focus on natural attractants like water-filled tree holes or trees in peak fruit. Since they are diurnal, you can disable the night-vision or infrared settings to save battery life, focusing your 'active' window from sunrise to sunset when the light in the canopy is most favorable for high-quality imagery.

Similar Species

Species that look similar or are commonly confused with Diana guenon.

Roloway Monkey

Very similar but larger with a significantly longer, more prominent pointed white beard.

Greater Spot-nosed Monkey

Lacks the white brow and beard, instead featuring a bright white spot on the tip of its nose.

Frequently Asked Questions

Diana guenons are diurnal, meaning they are active during daylight hours. They exhibit peak activity in the early morning as they begin foraging and again in the late afternoon before settling into their sleeping trees.

Because they require primary rainforest and high canopy cover, Diana guenons are not typically found in backyards unless your property borders an West African rainforest. To encourage them to visit a camera site, preserve old-growth trees and natural fruiting species like wild figs.

Their diet consists mainly of fruit, which provides the energy needed for their active lifestyle. They also consume insects, flowers, and young leaves, especially during seasons when fruit is less abundant.

No, they are quite rare in suburban areas. They are highly sensitive to habitat fragmentation and require large, undisturbed tracts of forest to thrive. They are currently listed as an endangered species due to habitat loss.

While similar, the Roloway monkey (Cercopithecus roloway) has a much longer, pointier white beard and a broader white brow. The Diana guenon's beard is shorter and its markings are slightly more compact.

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