Red-tailed Monkey in Budongo Forest

Red-tailed Monkey in Budongo Forest

If you walk any trail through Budongo Forest, the first primate you are likely to notice is not the chimpanzee you came to find — it is a red-tailed monkey. Copper tail flashing through the mid-canopy, white nose catching a shaft of light, a troop of fifteen or twenty animals chattering as they leap between mahogany branches: this is the soundtrack of Budongo’s forest-floor walks, and for many visitors it becomes the most reliable primate sighting of the day.

This guide profiles the red-tailed monkey (Cercopithecus ascanius) as you will encounter it in Budongo Forest, south of Murchison Falls. It covers how to recognise the species, where and when to look, how it behaves in the canopy, how it differs from the blue monkeys and colobus sharing the same trees, and what a realistic sighting looks like on a guided forest walk or chimpanzee trek.

Meet the Red-tailed Monkey: A Species Profile

Red-tailed monkeys belong to the guenon family — medium-sized African forest monkeys built for agile canopy travel. In Budongo the resident form is Cercopithecus ascanius schmidti, Schmidt’s red-tailed monkey, also called the black-cheeked white-nosed monkey or Schmidt’s guenon. Adults weigh roughly 3 to 4.5 kilograms, with males slightly larger than females, and a long tail that often exceeds body length and gives the species its common name.

The markings are unmistakable once you know them: a grizzled grey-brown body, dark limbs, a black face framed by white cheeks, and a bright white heart-shaped patch on the nose that stands out even at distance. The tail is the giveaway — a rich copper-red that contrasts sharply with the rest of the coat. Among Budongo’s primates, this combination makes the redtail the easiest guenon to identify on a first visit.

Red-tailed monkeys are diurnal and strongly arboreal, though they will descend to the ground to forage when fruit falls or insects are abundant. Long-term studies across Uganda show peak activity at sunrise and sunset, with quieter periods through the hotter middle of the day. They prefer forest edges and the middle canopy rather than the deepest interior — a habit that explains why troops appear so readily along Budongo’s well-used trails.

Social Life and Forest Behaviour

Red-tailed monkeys live in cohesive troops typically numbering from 15 to 40 individuals, though groups approaching 50 have been recorded in productive Ugandan forests. The social structure follows a familiar guenon pattern: a single resident adult male, a core of related females and their young, and juveniles that play and squabble at the edges of the group. When a troop grows too large, it typically splits — a process biologists call fission — with the two daughter groups then defending separate home ranges of roughly 24 to 60 hectares.

Unlike the fission-fusion society of chimpanzees, redtail troops tend to stay together through the day, travelling as a visible unit through the canopy. Females and juveniles help defend territory boundaries; young males eventually leave their natal group to wander as solitaries or join other troops during the breeding season. On a forest walk, redtails are the noisiest and most active of Budongo’s guenons — leaping between branches with confidence, pausing to scan for danger, then resuming feeding with little regard for observers below, provided you keep a respectful distance.

Redtails also form mixed-species associations with blue monkeys and, occasionally, other guenons — travelling and foraging in the same fruiting trees. Researchers suggest these polyspecific groups may reduce predation risk and improve foraging efficiency, which is why you often see redtails and blue monkeys side by side in the same mahogany crown.

Diet, Cheek Pouches and Seed Dispersal

Red-tailed monkeys are primarily frugivorous — ripe fruit forms the bulk of their diet, especially figs and other soft fruits abundant in Budongo’s semi-deciduous forest. When fruit is scarce they supplement with young leaves, flowers, buds, tree gum and a steady intake of insects such as caterpillars, grasshoppers and cicadas. Researchers describe them as frugivore-insectivores, reflecting this flexible omnivory.

Research in Budongo’s compartment N3, published in the African Journal of Ecology, documented redtails feeding alongside chimpanzees and blue monkeys on fig species including Ficus mucuso, F. varifolia and F. exasperata. The study found all three primates preferring ripe fig fruit to unripe growth, and spending the bulk of morning feeding hours in fruiting trees — behaviour that helps explain why a single productive fig can draw an entire primate community on a given morning walk.

One distinctive behaviour is the use of expandable cheek pouches. Adults often cram fruit into these pouches and carry it to a quieter perch before eating — a strategy that reduces theft from other troop members. Watch a redtail with bulging cheeks and you are seeing a monkey that has scored a prize it intends to enjoy in peace. As seed dispersers, redtails play a quiet but important role in Budongo’s ecology, depositing intact seeds across the forest floor as they travel — part of the regeneration machinery that keeps this ancient mahogany forest functioning.

Telling Redtails Apart from Blue Monkeys and Colobus

Three monkeys dominate the Budongo canopy, and the redtail is usually the first you learn to recognise. The blue monkey (Cercopithecus mitis) is closely related but far more cryptic — olive-grey with a pale throat, no white nose spot and no bright tail. Blue monkeys keep higher in the canopy and move more quietly; see our blue monkey guide for detail on telling them apart.

The black-and-white colobus (Colobus guereza) is unmistakable — glossy black with a flowing white mantle and a long white-tipped tail, often sitting still in exposed branches. Colobus are the easiest to photograph because they move slowly and hold positions; redtails are busier and harder to pin down. Read our colobus guide for comparison.

In short: white nose plus copper tail equals redtail; plain grey guenon high in the branches equals blue monkey; dramatic black-and-white cape equals colobus. The two guenons sometimes forage in mixed associations, so you may see redtails and blue monkeys in the same fruiting tree — a useful chance to compare them side by side.

Budongo Forest: Context for Your Sighting

Budongo Central Forest Reserve covers roughly 825 square kilometres on the Albertine Rift escarpment above Lake Albert — Uganda’s largest remaining natural forest and one of the most important primate habitats in East Africa. Of that total, more than 430 square kilometres form continuous virgin forest, with the remainder in buffer and production zones managed by the National Forestry Authority. The reserve sits inside the wider Murchison Falls Conservation Area and supports nine primate species, including chimpanzees, blue monkeys, black-and-white colobus, olive baboons, grey-cheeked mangabeys, and nocturnal pottos and galagos.

Decades of research from the Budongo Conservation Field Station — scientific work that began in the 1960s — have made this one of the best-studied primate forests on the continent. Red-tailed monkeys are not the headline species, but they are abundant throughout the canopy, and Uganda holds some of the highest population densities recorded for the species — locally up to 60 individuals per square kilometre in productive forest. For wider reserve context, see our Budongo Forest guide.

Where and When to See Them in Budongo

The best places to look are the two developed forest sites within and beside the Murchison Falls Conservation Area. Kaniyo Pabidi, about 8 kilometres from Kichumbanyobo Gate and roughly 25 to 30 kilometres north of Masindi on the Paraa road, is the primary access point. Redtails are resident throughout the sector and appear on virtually every chimpanzee trek and guided nature walk. See our Kaniyo Pabidi guide for access detail.

Rabongo Forest, a small riverine woodland island of roughly four square kilometres south-east of Paraa, holds redtails alongside colobus and baboons on UWA ranger-guided walks — typically reached by about 90 minutes on murram tracks from the lodge hub. The Royal Mile at Busingiro, west of Masindi, also supports redtails on birding and botanical walks through tall mahogany.

Aim for the first cool hours, from around 07:00 to 10:00, when troops are most active and vocal. The drier months of December to February and June to September firm the trails and make walking easier, though the forest rewards visitors year-round. Rubber boots can be hired at the gate when paths are muddy after rain.

Chimp Treks and General Forest Walks

You do not need a chimpanzee permit simply to look for red-tailed monkeys. A forest entry fee and a compulsory ranger guide — roughly US$10 to US$20 depending on the trail — cover a general primate walk at Kaniyo Pabidi. Guides know the fruiting trees the troops favour and can pick out movement you would otherwise walk past. See our forest walks in Budongo page for what to expect.

If you do book chimpanzee tracking — permits run around US$130 for foreign non-residents under the current UWA tariff — redtails are almost guaranteed along the route. Treks depart after briefings at roughly 07:30 and 13:30, in groups capped at six visitors, and typically last two to four hours before the hour with habituated chimps. The redtails, colobus, blue monkeys and grey-cheeked mangabeys you encounter en route are the forest’s bonus primates. For booking detail, see our Budongo chimp trekking guide.

Photography Tips

Red-tailed monkeys are among the more photographable Budongo primates because they move through the middle canopy at eye level rather than vanishing into the upper storeys. Early morning light through the mahogany canopy is your best ally — soft, directional and warm enough to pick out the copper tail against grey-brown fur. A zoom lens in the 200–400mm range outperforms a phone in the dim understorey, and a fast shutter speed helps freeze mid-leap shots.

Patience matters more than proximity. Troops often pause to feed in one tree for several minutes, giving you time to frame the white nose patch and tail without chasing the group. Avoid flash — it disturbs wildlife and produces harsh results in dappled forest light. Listen for movement and contact calls before you see the animals; a rustle overhead or a sharp chirp is often the first clue that a troop is directly above the trail.

Conservation Status

The red-tailed monkey is listed as Least Concern on the IUCN Red List, assessed most recently in 2018, and remains locally common across much of Uganda’s forest network. That said, the species is not immune to the pressures affecting forests nationwide. Habitat loss through logging and agricultural encroachment, hunting in unprotected areas, and crop-raiding conflict on forest margins all take a toll in regions where protection is weak.

Budongo’s status as a managed reserve — with ecotourism revenue supporting patrols and long-term research — makes it an important stronghold. Responsible forest visits, keeping distance from wildlife, and never feeding monkeys all support the work of the Uganda Wildlife Authority and the Budongo Conservation Field Station. A sighting here is common; it is also worth appreciating as evidence of a forest still functioning as it should.

Frequently Asked Questions

Why is the red-tailed monkey so easy to see in Budongo?

Redtails are abundant, active in the middle canopy where trails pass beneath them, and relatively bold compared with shyer species such as blue monkeys. Troops of 15 to 40 animals travel visibly through the trees, so most guided walks and chimp treks encounter them.

Do I need a separate permit to see red-tailed monkeys?

No. A forest entry fee and compulsory guide cover general primate viewing. A separate chimpanzee permit is only required if you want the dedicated one-hour encounter with habituated chimps.

What is the difference between a red-tailed monkey and a blue monkey?

Redtails have a bright white nose spot and a coppery-red tail and are far more active and conspicuous. Blue monkeys are plainer olive-grey, quieter and more retiring, and tend to stay higher in the canopy. The two species are related and sometimes travel together.

Can chimpanzees hunt red-tailed monkeys?

Budongo’s chimpanzees are known hunters, but their preferred prey is black-and-white colobus rather than redtails. Red-tailed monkeys are more agile and less commonly targeted, though occasional predation cannot be ruled out.

When is the best time to see red-tailed monkeys in Budongo?

Early morning, year-round. The drier windows from December to February and June to September make forest trails firmer underfoot, but troops are active in every month.

Plan Your Safari

A red-tailed monkey sighting fits naturally into a wider Budongo forest morning and a Murchison Falls safari — canopy primates one day, Nile launch cruises and Buligi game drives the next. For more on the reserve, see our Budongo Forest guide, the best places to see primates in Budongo Forest, and our Budongo and Murchison Falls safari itinerary. Get in touch to build a tailored trip that weaves forest primates into the wildlife of the wider park.