This is the story of the beautiful forest partridges of Udzungwa National Park

DAR ES SALAAM: ZOOLOGISTS say that Udzungwa Mountains National Park is home to the elusive Udzungwa forest partridge. Scientists describe partridges as medium-sized galliform birds belonging to several genera, with a broad natural distribution across parts of Europe, Asia and Africa.

The Udzungwa forest partridge was named after the Udzungwa Mountains, where it was first discovered. Notably, this bird is so distinctive that its genus is considered unique within the order Galliformes, highlighting its remarkable evolutionary lineage.

The Udzungwa forest partridge is a captivating and little-known bird species native to the lush montane forests of Tanzania. This elusive bird has drawn the attention of ornithologists and conservationists alike due to its striking appearance, secretive behaviour, and highly restricted habitat.

First discovered in 1991, the Udzungwa forest partridge quickly proved to be of exceptional scientific importance. Researchers determined that it was not only a new species, but an entirely new genus with no close relatives in Africa. Its uniqueness has made it a key focus in conservation efforts, as its survival is closely tied to the fragile ecosystem of the Udzungwa Mountains.

This species is endemic to the montane forests of the Udzungwa Mountains in south-central Tanzania, part of the ancient Eastern Arc Mountain range. Rising over 2,500 meters above sea level, these mountains are covered in dense, moist tropical forests that provide the ideal habitat for the partridge.

Estimates suggest that around 10,000 individuals remain in the wild, all confined to this limited region. Genetic and morphological studies reveal that the Udzungwa forest partridge is most closely related to hill partridges found in the forests of Southeast Asia, including countries such as Thailand, Vietnam and China. Some scientists believe that millions of years ago, ancestral forest partridges were distributed across a vast belt stretching from Asia to Africa.

As the climate changed and forests receded, much of this population disappeared. In Asia, surviving groups diversified into more than 20 species. In Africa, however, nearly all were lost—except for this isolated population in the Udzungwa Mountains.

This surviving lineage is thought to have persisted for over 30 million years, making the Udzungwa forest partridge not only a rare species, but also a remarkable living relic of an ancient evolutionary history.

Zoologists working in Udzungwa Mountains National Park report that the Udzungwa forest partridge is typically found at elevations between 900 and 2,200 meters, where the forest floor is thick with leaf litter and dense undergrowth. Within the park, sightings are largely limited to two key areas: The Ndundulu– Luhombero forest, which supports the largest population, and the Nyumbanitu forest, where a smaller population persists.

The species has an extremely restricted distribution, confined to isolated patches of montane forest. The Udzungwa Mountains themselves are fragmented by valleys and human settlements, separating forest blocks and limiting movement between them.

This geographic isolation has played a major role in shaping the bird’s evolutionary uniqueness. While the main population occurs in the Udzungwa Mountains, a closely related but distinct species, the Rubeho Forest Partridge, inhabits the Rubeho Highlands, approximately 100 kilometres to the north. Scientific studies suggest that this population has remained isolated for around 200,000 years, largely because these birds tend not to disperse far from their native habitats.

Further genetic and morphological research, particularly studies conducted in 2005, confirmed that the Rubeho population is sufficiently distinct to be classified as a separate species. This finding underscores the evolutionary significance of these forest partridges and highlights the importance of conserving each population as a unique lineage.

Although both the Udzungwa and Rubeho forests are part of the ancient Eastern Arc Mountain chain, they are separated by inhospitable terrain that prevents interbreeding. This isolation, combined with their limited range, makes both species especially vulnerable to habitat loss and fragmentation. Partridges in general are medium-sized, ground-dwelling birds, typically falling between larger pheasants and smaller quail in size.

They often display subdued plumage, with shades of grey and brown that provide effective camouflage. The Udzungwa forest partridge itself is a small but robust bird, measuring about 25 to 29 centimeters in length and weighing between 200 and 300 grammes.

Its plumage is both striking and functional: the upperparts are olive-brown with bold dark barring, while the underparts are soft grey, allowing it to blend seamlessly into the dappled light of the forest floor.

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Males and females are very similar in both size and coloration, making them difficult to distinguish in the wild. Juveniles resemble adults but tend to have duller tones and less defined markings until they fully mature. Adapted to life in dense forest, the bird has short, rounded wings suited for maneuvering through thick vegetation rather than sustained flight.

As a result, it flies only in short bursts, typically to escape predators or move between feeding areas. The Udzungwa forest partridge is a shy and secretive bird, most often encountered alone, in pairs, or in small family groups rather than large flocks. It spends the majority of its time on the forest floor, foraging by scratching through leaf litter and dense undergrowth in search of food.

Although primarily terrestrial, the bird is capable of short, rapid flights to escape danger. However, it generally prefers to remain concealed within thick vegetation.

Its vocalisations are subtle, consisting of soft, low-pitched calls that are most commonly heard during the early morning and at dusk. Interestingly, some field observations describe the species as relatively confiding, occasionally allowing human observers to approach within a few meters while it feeds.

Despite this, it remains difficult to study, and even extended fieldwork often results in only a handful of sightings. When disturbed, the bird usually runs rather than flies, taking to the air only when startled, and typically landing again within a short distance.

Udzungwa forest partridges may form small flocks of up to eight individuals, though the average group size is closer to three. During the breeding season, these groups tend to become smaller as birds form pairs. At night, they may roost on low branches rather than on the ground.

Due to its elusive nature, relatively little is known about the breeding behaviour of the species. Available evidence suggests that breeding occurs during the rainy season; from November to April in the Udzungwa Mountains, when food resources are more abundant.

Observations indicate that the species is likely monogamous. Birds are most often seen in pairs defending territories, rather than in larger breeding groups. Males produce loud advertisement calls—short series of clear notes that can carry up to 100 meters—typically in the morning.

These calls serve to establish territory and attract mates, a behaviour commonly associated with monogamous birds. Nests are believed to be simple scrapes on the forest floor, lined with leaves or grass and hidden beneath dense shrubs.

Females typically lay between three and five eggs, with an incubation period of around three to four weeks. While some reports suggest the female undertakes most of the incubation, others indicate that both parents may share this responsibility.

During this time, the male plays an active role in defending the territory. After hatching, the chicks are precocial—relatively welldeveloped and mobile shortly after birth. They quickly begin foraging alongside their parents but remain well hidden to avoid predators.

Juveniles gradually acquire adult plumage over several months before becoming independent. Despite these insights, many aspects of the species’ breeding biology remain poorly documented. Its nest has never been definitively observed, though females with brood patches have been recorded in January, and chicks have been seen between November and January.

These observations further support the link between breeding and the rainy season. Notably, adults are usually seen with only one or two chicks, suggesting that this species may have smaller brood sizes than other partridges.

In terms of diet, the Udzungwa forest partridge feeds on a variety of invertebrates and plant material, including beetles, ants, flies, insect larvae, woodlice and seeds. Foraging typically occurs in small groups that move slowly across the forest floor.

The birds use their feet to scratch and toss aside leaf litter, exposing hidden prey, and may also snap insects directly from foliage. Feeding activity sometimes takes place near forest trails, particularly at dusk.

Due to its extremely limited range and ongoing habitat pressures, the Udzungwa forest partridge is classified as endangered. Its survival depends heavily on the protection of its forest habitat within the Udzungwa Mountains, making conservation efforts in this region critically important. Email: rstanslaus@yahoo.com