The Black-Bellied Pangolin: Africa’s Rarest and Most Elusive Tree Pangolin

Deep in the primary rainforests of the Congo Basin, suspended from a branch by an extraordinarily long prehensile tail, a small, dark-skinned pangolin probes the canopy for arboreal ants. This is the black-bellied pangolin (Phataginus tetradactyla), also known as the long-tailed pangolin — the smallest, rarest, and least-studied of all eight pangolin species. While its more familiar relative, the white-bellied pangolin, has received increasing conservation attention as the most commonly trafficked African pangolin, the black-bellied pangolin remains a scientific enigma: a species so elusive that basic population data, home range estimates, and ecological requirements are still largely unknown.

What makes the black-bellied pangolin remarkable is not just its scarcity but its anatomy. It possesses the longest tail of any mammal relative to body size and the highest number of caudal vertebrae recorded in any living mammal — up to 47. This extraordinary adaptation reflects a life lived almost entirely in the trees, in one of the world’s most threatened biomes.

Taxonomy and Classification

The black-bellied pangolin belongs to the genus Phataginus, which it shares with the white-bellied pangolin (Phataginus tricuspis). These two species represent Africa’s arboreal pangolins, distinct from the ground-dwelling Smutsia genus. The species name tetradactyla means “four-fingered,” a reference to the four functional claws on each forefoot — most pangolins have five, though the fifth claw is vestigial in several species. Despite being described by Linnaeus as early as 1766, the black-bellied pangolin has received less scientific attention than any other pangolin species, with fewer than 30 peer-reviewed studies focusing specifically on the species as of 2025.

Physical Description

The black-bellied pangolin is the smallest of Africa’s four pangolin species and the second smallest of all eight species globally. Adults typically weigh between 2 and 3 kilograms, with a head-body length of 25 to 40 centimetres. The tail, however, is where the species is truly exceptional: it can exceed 60 centimetres in length, often reaching nearly twice the head-body length, and is powerfully prehensile. The tail contains up to 46 or 47 caudal vertebrae — more than any other extant mammal — giving it remarkable flexibility and gripping strength.

The dorsal scales are brown to dark olive-brown and overlap in the typical pangolin fashion. Critically, the underside — the belly, throat, and inner limbs — is covered in dark or blackish skin, clearly distinguishing the species from the pale-bellied Phataginus tricuspis. The scales lack the three-pointed cusps found on the white-bellied pangolin, appearing more rounded or bluntly pointed. Each forefoot has four well-developed claws, with the fifth digit highly reduced.

Habitat and Range

The black-bellied pangolin inhabits the tropical lowland rainforests of West and Central Africa. Its range extends from Sierra Leone and Liberia in the west, through Ghana, Nigeria, Cameroon, Equatorial Guinea, Gabon, the Republic of Congo, and into the Democratic Republic of the Congo. Compared to the white-bellied pangolin, which tolerates a wider variety of habitats including secondary forest and forest-savanna mosaics, the black-bellied pangolin is more closely associated with intact primary and mature secondary rainforest.

This dependence on primary forest makes the species particularly vulnerable to deforestation. The black-bellied pangolin appears to require continuous canopy cover for arboreal foraging and movement. It has been occasionally recorded in gallery forests and riverine forest strips but is rarely found in heavily degraded or open habitats. Its core range centres on the Congo Basin, one of the world’s largest remaining tropical forest blocks and a region facing accelerating pressure from industrial logging, mining, and agricultural expansion.

Diet and Behaviour

The black-bellied pangolin is highly arboreal — more so than any other pangolin species. It spends the vast majority of its time in the canopy, descending to the ground infrequently. Its long, prehensile tail serves as a fifth limb, allowing it to suspend its entire body weight from a branch while using its forelimbs to tear open arboreal ant and termite nests. The tongue, like that of all pangolins, is long and sticky, adapted for extracting insects from narrow spaces within bark and wood.

The black-bellied pangolin’s extreme arboreality and nocturnal habits make it exceptionally difficult to study. Most population estimates for the species are derived from bushmeat market surveys rather than direct field observations — an indirect method that reveals exploitation rates but tells researchers little about wild population density or ecology.

Like other pangolins, the black-bellied pangolin is strictly nocturnal and solitary. During the day it rests in dense vegetation tangles, epiphyte clusters, or tree hollows high in the canopy. Reproduction follows the typical pangolin pattern of a single offspring per birth, though gestation length and other reproductive parameters remain poorly documented for this species. The young pangolin rides on the mother’s tail base during foraging and is believed to become independent at several months of age.

When threatened, the black-bellied pangolin curls into a tight ball like other pangolins, though its arboreal lifestyle means it may also simply climb higher into the canopy to escape terrestrial predators. Natural predators include large raptors, pythons, and leopards, though human hunting represents the primary source of mortality across most of its range.

Threats

Deforestation

The black-bellied pangolin’s dependence on intact primary rainforest places it at particular risk from tropical deforestation. Across West Africa, the species has likely suffered significant range contraction as the region’s forests have been reduced to fragments. In the Congo Basin, which holds the largest remaining population, industrial logging concessions, mining operations, and the expansion of smallholder agriculture are progressively fragmenting forest habitat. Roads built for resource extraction also open previously inaccessible forest to hunters, creating a secondary threat multiplier.

Bushmeat hunting

The black-bellied pangolin is regularly encountered in bushmeat markets across West and Central Africa, though less frequently than the white-bellied pangolin. In Cameroon, Gabon, and the Democratic Republic of the Congo, market surveys consistently record both Phataginus species, with the black-bellied pangolin typically comprising a smaller proportion of catches. Hunters using snares, nets, and dogs in forested areas capture both species opportunistically, and the small body size of the black-bellied pangolin does not deter its sale as meat.

Incidental scale trade

While the black-bellied pangolin is not specifically targeted by international trafficking networks to the same degree as the white-bellied pangolin, its scales enter the trade when harvested alongside those of Phataginus tricuspis. Large-scale pangolin scale seizures from African shipments bound for Asia typically contain a mix of species, and forensic analysis has confirmed the presence of black-bellied pangolin scales in multiple confiscations. The species thus faces collateral pressure from the same trafficking pipeline that drives the exploitation of Africa’s more commonly traded pangolins.

Conservation Status and Challenges

The IUCN classifies the black-bellied pangolin as Vulnerable, one threat category below the Endangered status assigned to the white-bellied pangolin. However, the Pangolin Specialist Group has noted that the Vulnerable classification may underestimate the species’ true risk, precisely because so little population data exists. When a species is too elusive to census reliably, assessments necessarily rely on indirect indicators — and for the black-bellied pangolin, those indicators point toward decline.

Conservation efforts for the black-bellied pangolin face a fundamental data gap. Without baseline population estimates, home range studies, or a clear understanding of habitat requirements beyond “primary forest,” it is difficult to design targeted interventions. Current protection comes primarily from the species’ inclusion in CITES Appendix I (since 2017), national hunting bans in several range states, and the protected area networks that cover portions of its range — including the intact forest blocks of the Congo Basin.

The black-bellied pangolin is a reminder that conservation cannot focus solely on the species we know best. While the white-bellied and Temminck’s ground pangolins receive the majority of research and conservation investment in Africa, the black-bellied pangolin slips deeper into obscurity — its decline measured not in census data but in the steady erosion of the primary forests it depends on.

Priority actions identified by researchers include dedicated ecological field studies using camera traps and radio telemetry to establish basic population parameters, improved species-level identification in bushmeat and trafficking markets, and strengthened protection of primary rainforest within the species’ core range in the Congo Basin.

Why the Black-Bellied Pangolin Matters

Every pangolin species matters, but the black-bellied pangolin occupies a unique position as both the least known and potentially the most habitat-sensitive of the eight. Its extreme arboreality and dependence on intact forest make it a sensitive indicator of tropical forest health in West and Central Africa. If the black-bellied pangolin disappears from a forest, it signals a level of degradation that may have already pushed other canopy-dependent species toward local extinction.

The species also represents an evolutionary lineage of remarkable adaptation. Its record-breaking tail vertebrae count, extreme arboreal specialisation, and unique scale morphology reflect millions of years of evolution in the African rainforest canopy. Losing Phataginus tetradactyla would mean losing not just a species but an irreplaceable branch of mammalian evolutionary history.