When the last light fades over Bwindi Impenetrable National Park and the forest falls into darkness, a different ecosystem comes alive. The birds that fill the daytime with song fall mostly silent, replaced by a nocturnal soundscape of extraordinary complexity and strangeness. Visitors who sleep in lodges at the forest edge or who spend time on lodge verandas after dinner discover that the night forest is at least as rich acoustically as the day forest, and often considerably more atmospheric. Understanding what produces Bwindi’s night sounds — which calls belong to which animals, and what the sounds signify in the lives of the creatures making them — deepens the overall forest experience in ways that purely visual wildlife watching cannot fully achieve.
The soundscape at dusk: transition and twilight callers
The transition from day to night in Bwindi is marked by a distinctive acoustic shift that experienced guides use to gauge time as accurately as any watch. In the final hour before full darkness, diurnal birds complete their evening song routines: thrushes and robins intensify their singing, as do many of the warblers and flycatchers that have been active throughout the day. This evening chorus has a slightly different quality from the dawn chorus, less frenetic and more sustained, as if the birds are consolidating their territorial claims before the period of enforced acoustic silence that night imposes on most species.
As the light level drops below the threshold for most bird activity, the first nightjars begin calling. Bwindi hosts several nightjar species including the Montane nightjar (Caprimulgus poliocephalus), whose churring, mechanical call is among the first nocturnal sounds to reach a listener on a forest-edge veranda. Nightjars are masters of acoustic camouflage: their calls carry far but are directionally ambiguous, making it nearly impossible to locate the calling bird with a torch even when it is only metres away. The churring seems to come from everywhere and nowhere simultaneously, a characteristic that is unsettling on first encounter and deeply evocative once familiar.
Owls: the night forest’s most vocal predators
Bwindi’s owl community is diverse and vocally active, particularly during the first half of the night. The African wood owl (Strix woodfordii) produces a rich, bubbling series of hoots that descends in pitch and carries considerable distance through the forest. This is one of the most commonly heard owl calls at Bwindi and is often the first nocturnal bird call that visitors unfamiliar with African forests associate with their experience there.
The Fraser’s eagle-owl (Bubo poensis) is less commonly heard but produces a deep, resonant double hoot that is unmistakably owl-like even to listeners who have never heard it before. This large owl hunts in the forest interior and mid-canopy, taking prey from small mammals and birds to large insects. Its calls intensify around midnight and again before dawn, following a calling pattern common to owls that increases vocal activity during transitions between deep sleep and active hunting phases.
The African scops owl (Otus senegalensis) is perhaps the most persistently audible night bird at Bwindi, producing a repetitive single-note “proo” call that continues for hours at a time from a fixed position in dense vegetation. Its small size and cryptic plumage make it essentially invisible even when calling within arm’s reach, and the monotonous call, while initially charming, can become the background note of a night’s sleep for visitors whose lodge windows open onto the forest edge.
Primates after dark: bushbabies and pottos
The gorillas that bring visitors to Bwindi sleep through the night in their freshly built nests, silent and invisible. But the forest’s other primates are active after dark. The Thomas’s bushbaby (Galagoides thomasi), a small prosimian with enormous eyes adapted for nocturnal vision, produces a surprisingly loud, almost human-sounding cry that has startled countless visitors unaware of its source. Bushbabies are highly vocal, using calls to maintain contact between individuals and to advertise territories, and their calls have a quality — sharp, clear, carrying emotional overtones that human ears cannot help but interpret — that is disproportionately striking for an animal the size of a squirrel.
The potto (Perodicticus potto) is Bwindi’s other significant nocturnal primate, a slow-moving, thick-furred creature that travels through the canopy at night by deliberate hand-over-hand locomotion rather than the explosive leaping of bushbabies. Pottos are quieter than bushbabies and rarely seen, but their presence is occasionally betrayed by low grunting vocalisations or by the response of sleeping birds that they approach too closely on their nocturnal hunting routes.
Encountering a bushbaby in torchlight — those enormous reflective eyes appearing in the beam at face height from a branch five metres away — is one of Bwindi’s most startling nocturnal experiences. The eye shine of nocturnal animals is produced by the tapetum lucidum, a reflective layer behind the retina that improves night vision by allowing light to pass through the photoreceptors twice. Torchlight hitting this layer at the right angle produces the distinctive orange-red glow that announces a nocturnal mammal’s presence before any other feature is visible.
Insects and amphibians: the forest’s bass section
The deepest layer of Bwindi’s night soundscape is produced not by birds or mammals but by insects and frogs. Crickets and katydids fill the acoustic space vacated by diurnal animals with continuous, high-frequency stridulation that rises and falls in pulses reflecting temperature changes through the night. At altitude in Bwindi, where temperatures drop significantly after dark, insect calling is most intense in the earlier part of the night before cooling slows metabolic activity.
Tree frogs of multiple species add their voices to the nocturnal chorus, particularly near streams and wet areas within the forest. Uganda’s highland forests support a remarkable frog diversity including several species endemic to the Albertine Rift, and the calls they produce range from high bell-like notes to the deep rhythmic croaking of larger species. Frog calls intensify after rain, when breeding activity peaks and males compete vocally for female attention at temporary pools and stream edges throughout the forest.
The combined effect of insect and frog calls is a continuous, enveloping ambient sound that experienced forest visitors describe as profoundly immersive. Unlike urban noise environments, this biological soundscape is structured and meaningful — every element is an animal communicating, competing, or signalling its metabolic state. Attending to it attentively, rather than filtering it as background noise, reveals a parallel world of nocturnal activity that the daytime forest only hints at.
Listening actively: tips for the night forest experience
The most productive way to engage with Bwindi’s night soundscape is from a fixed position — a veranda, a forest clearing, or a flat rock — that offers listening angles into both open sky and closed forest. Moving through the forest at night disturbs calling animals within a radius of several metres and replaces the natural soundscape with the noise of one’s own passage. Sitting still for twenty to thirty minutes, allowing the forest to resume normal activity around a settled, quiet presence, consistently produces richer auditory encounters than active night walking.
Bringing a recording device — a smartphone works adequately, a dedicated audio recorder produces better results — allows the sounds captured to be identified subsequently using apps such as Merlin Bird ID or shared with experts. Many lodge guides have detailed knowledge of the area’s nocturnal species and can identify calls heard during the night either in real time or from recordings played back the following morning. This identification process transforms memorable sounds into named encounters with specific species, anchoring the nocturnal experience in the same ecological framework as the daytime wildlife encounters.
The night forest of Bwindi is not accessible to gorilla trekkers in the way that the daytime forest is — night walks outside of designated areas and without ranger accompaniment are not permitted, and the safety rationale for this restriction is sound. But the forest comes to the visitor readily enough through open windows and lodge garden positions, and the sounds that arrive uninvited through the darkness are as much a part of what Bwindi is as the gorillas encountered by daylight. Listening to them carefully is one of the simplest and most rewarding ways to extend the forest experience beyond the few hours that a gorilla trek provides.
