The full field guide
Wildlife in Udzungwa Mountains National Park
Two primates that exist nowhere else on Earth, eleven primate species in total, a duiker so elusive nobody photographed it in the wild until 2003, and around 400 birds including two found only in these forests. This is a primate and bird park, not a big-game park, and the difference is the whole point.
What you meet on foot
Colour is your guide: green means count on it, amber means a realistic shot, terracotta means you need luck, grey means the species is not here whatever you have read elsewhere. Udzungwa's list is short by savanna standards and extraordinary by any other measure, because what it holds is found in very few other places.
The single most important adjustment to make before you arrive: this is closed-canopy montane rainforest, so you hear far more than you see, and your guide's ear is worth more than your binoculars. Primates are the reliable sightings. Everything with hooves or claws is a bonus.
- Udzungwa red colobus Guaranteed Canopy, daytime, Sanje and Mwanihana
- Angolan pied colobus Very likely Forest edges
- Sykes' or blue monkey Very likely Park-wide
- Yellow baboon Very likely Lower slopes and farm edges
- Sanje mangabey Good chance Njokamoni and Mwanihana, rarely on the main Sanje route
- Bushbuck Good chance Better odds on plateau routes
- Blue duiker Good chance Quieter trails such as Njokamoni
- Red duiker Good chance Njokamoni trail
- Forest hog Good chance Sources disagree on how common
- Elephant shrews Good chance Common incidental on Njokamoni
- Abbott's duiker Takes luck Not photographed in the wild until 2003
- Elephant Takes luck High interior plateau only
- Buffalo Takes luck Hidden Valleys and upper Mwanihana
- Leopard Takes luck Present, effectively never seen
- Kipunji Not here Ndundulu, a separate reserve outside the park
- Lion Not here Rainforest, not savanna. No population here
- Greater kudu Not here Another savanna species wrongly listed for Udzungwa
- Zebra Not here No open grassland plains in the park
Chances reflect a typical two or three-day visit walking the main trails with a TANAPA guide. Species silhouettes from PhyloPic (CC0, CC BY and CC BY-SA).
The two primates found nowhere else on Earth
The Udzungwa red colobus, Piliocolobus gordonorum, is the reason most people come. It lives in these forests and nowhere else, with a population put at 25,000 to 35,000 mature individuals in a 2009 assessment, and it is the park's most dependable primate: you should see it in the canopy on either the Sanje or the Mwanihana trail, in daylight, without working hard for it.
Two naming points worth clearing up. Iringa red colobus and Uzungwa red colobus are synonyms for exactly this species, not separate animals, and TANAPA's own brochure uses Iringa Red Colobus. That same brochure prints the binomial as Colobus gordonolum, which is a corrupted spelling; the correct name is Piliocolobus gordonorum.
The Sanje mangabey, Cercocebus sanjei, is the harder and in some ways the better prize. It was discovered in 1979 when researchers in the Mwanihana forest heard a call they could not place, and formally described in 1986. The IUCN lists it as Endangered. The most recent published figure is around 1,300 individuals from 2005; a 2020 acoustic survey exists but we could not retrieve its number, so we are not going to guess at one.
It occupies only two forest blocks between 300 and 1,800 metres. Your odds are best on the Njokamoni trail and on the Mwanihana climb, and genuinely poor on the busy Sanje route, so if the mangabey is your priority, say so at headquarters when you are assigned a guide.
The kipunji: not in this park, and worth knowing why
The kipunji, Rungwecebus kipunji, is one of the great primate stories of this century. It was found in December 2003, described in 2005, and given a brand-new genus in 2006, the first new African monkey genus in roughly eighty-three years. Around 1,800 individuals survive in 59 groups across a total range of 17.7 square kilometres.
A visitor to Udzungwa Mountains National Park cannot see it. The kipunji occurs in two disjunct places: the Ndundulu forest, which lies in the wider Udzungwa range but is a separate reserve outside the national park, and the Mount Rungwe and Livingstone Mountains area about 350 kilometres away. Habituation for tourism is described as being planned, not implemented.
We mention it because tour listings sometimes fold the kipunji into an Udzungwa itinerary. If you are booking a trip specifically to see one, you are booking the wrong park.
The other nine primates
The official brochure counts eleven primate species in the park. Other sources say six, or five endemics, depending entirely on how they count subspecies and which forest blocks they include, so treat any single number as an approximation.
In practice you will meet three more with regularity. The Angolan pied colobus, black and white and much larger-looking than it is, works the forest edge and is a low-difficulty sighting. Sykes' monkey, also called the blue monkey, is genuinely park-wide and turns up around the lodges as readily as on the trails. Yellow baboons hold the lower elevations and the farm boundary, and are the one primate here you should keep food away from.
Greater galago is regionally plausible but we found no Udzungwa-specific data, and since night walks are not offered in this park you would have no legitimate way to look for one anyway.
The animals that make an armed ranger compulsory
Elephant and buffalo do live in Udzungwa, but almost entirely on the high interior plateau and in the remote valleys: the Hidden Valleys, the upper Mwanihana slopes. Official descriptions use the phrase rarely encountered, and that is accurate. This is precisely why TANAPA requires an armed ranger on the multi-day and plateau routes and not on the day walks near Mang'ula. A surprise encounter with a forest buffalo on a narrow trail is a serious matter.
Leopard are present and are effectively never seen. They are nocturnal, the forest is dense, and there are no night activities in the park.
The rarest thing you could plausibly walk past is Abbott's duiker, a large forest antelope so retiring that nobody managed a photograph of one in the wild until 2003. Blue duiker, red duiker, bushbuck and bushpig or forest hog are all present, with sources disagreeing about how often each is actually encountered.
The endemism goes well beyond mammals
The park has its own lizard, Cnemaspis udzungwae, its own frog, Phrynobatrachus udzungwensis, and endemic chameleons. There are more than 250 butterfly species recorded, three of them named endemics, and they are at their most spectacular in the wet months when the wildflowers are out.
This is what people mean when they call the Eastern Arc an evolutionary laboratory. Ten million years of isolation on a mountain island produces animals that occur across a few hundred square kilometres and nowhere else in the world.
Birds: around 400 species and two the park owns outright
TANAPA states the total as exactly 400 species; third parties round it up to over 400. TANAPA names only two strict park endemics, the Udzungwa forest partridge and the rufous-winged sunbird. You will see a tourism figure of twelve full endemics plus ten near-endemics; that almost certainly counts Eastern Arc endemics across the whole mountain chain rather than species restricted to this park, so the honest framing is two strict park endemics plus a set of Eastern Arc near-endemics.
Where you walk determines what you get. One day on the Sanje trail gives you a good overview. Two or more days on Mwanihana puts you in the altitude band where the endemics live. Three or more on Lumemo gives serious listers the widest diversity in the park.
TANAPA rates December to February as the birding peak, when migratory species are nesting. That sits inside the wetter half of the year, so birders and hikers want opposite months here.
- Udzungwa forest partridge A strict park endemic found in 1991 and described in 1994 in a brand-new genus whose closest relatives are Asian hill-partridges, which makes it one of Africa's great biogeographic relicts
- Rufous-winged sunbird The park's other strict endemic, an Eastern Arc restricted-range species that occurs essentially nowhere outside these forests
- Iringa akalat A restricted-range Eastern Arc robin of the Udzungwa and Ndundulu forest complex, and the classic skulking forest-floor target
- Dapple-throat A rare and poorly known Eastern Arc and southern-highlands speciality that birding guides single out as a park highlight
- Loveridge's sunbird Globally Endangered and restricted-range, listed among the park's threatened specialities alongside the two strict endemics
Where to look, trail by trail
| Trail | Best for |
|---|---|
| Sanje Waterfall | Both colobus species, commonly and reliably, plus the falls themselves. The busiest route, so the shyer species keep away |
| Njokamoni | The best odds in the park for Sanje mangabey, plus red duiker, elephant shrews and squirrels on a much quieter path |
| Mwanihana Peak, 3 days | Sanje mangabey again, the full altitude sequence of habitats, and the montane and bamboo-zone birds |
| Hidden Valleys, Campsite 3 | Open grassy valleys favoured by elephant, which is exactly why a ranger is mandatory |
| Lumemo Trail, 5 days | Maximum bird diversity and deep wilderness, for people with the fitness and the days to spend |
| Prince Bernhard and Sonjo falls | Short easy walks near headquarters: Sykes' monkeys, baboons and forest birds without a climb |
One thing you will read that is simply wrong
At least one website lists lions and kudu for Udzungwa. Both are savanna animals, this is montane rainforest, and the content is almost certainly copied from a savanna-park template. There are no lions here and there is no open plains game.
Where a number is missing rather than uncertain, we have left it out. The Sanje mangabey population has not been publicly updated since 2005, so 2005 is what we print.
All wildlife figures on this page come from TANAPA's own Udzungwa brochure and published assessments. Where sources conflict, we have said which one we follow and why.