Can Pangolins Swim? River Crossing Behaviour Explained

Most people picture pangolins as shy, terrestrial creatures that roll into a ball when threatened. Few associate them with water. Yet field researchers and conservation rangers who track pangolins across African and Asian landscapes have long known that these armoured mammals are far more capable in water than their appearance suggests.

The Swimming Mechanics of a Scaled Mammal

A pangolin entering water faces a significant physical challenge. Its body is covered in overlapping keratin scales that, while light individually, form a substantial collective mass across the dorsal surface, flanks, and tail. The scales do not trap air in the way that waterproof fur might, and they offer negligible thermal insulation once wet. On paper, the pangolin looks like a poor swimmer.

In practice, pangolins compensate through a well-documented behavioural adaptation: they swallow air before or during water entry, inflating their stomachs to increase overall buoyancy. This mechanism has been observed in ground pangolins (Smutsia temminckii) in southern Africa and in Sunda pangolins (Manis javanica) in Southeast Asia. The inflated stomach acts as an internal float, counteracting the weight of the scales and keeping the animal relatively high in the water column.

Once in the water, pangolins propel themselves with lateral undulations of the tail and hind body combined with paddling movements of the limbs. The motion is not elegant. Pangolins are not built for sustained aquatic locomotion. They move slowly and steadily, maintaining a heading across the current rather than fighting it. Field observations suggest they choose crossing points where the river is at its widest and shallowest rather than seeking the shortest route, which would often involve deeper, faster-moving water.

Which Pangolin Species Swim?

Swimming ability has been documented across multiple pangolin species, though the frequency with which individuals enter water varies considerably depending on habitat.

African Ground Pangolin

The ground pangolin inhabits savanna and bushveld across sub-Saharan Africa, where seasonal rivers and drainage lines are part of the landscape. These animals have been photographed and filmed crossing rivers of modest width, particularly during the wet season when foraging pressure increases and individuals range further in search of ant and termite colonies. Camera trap footage from reserves in Botswana and Zimbabwe has captured ground pangolins entering water at dusk, crossing deliberately, and emerging on the far bank without apparent distress.

Giant Ground Pangolin

The giant ground pangolin (Smutsia gigantea) of Central and West Africa inhabits lowland rainforest and forest margins where rivers are frequent and often substantial. Anecdotal accounts from local communities and researchers working in the Congo Basin describe these large animals crossing rivers. Given their size — adults can exceed 35 kilograms — the energetic cost of water crossing is considerable, and they presumably cross only when foraging or reproductive pressures make the cost worthwhile.

Sunda Pangolin

The Sunda pangolin, which ranges across Malaysia, Indonesia, Thailand, and neighbouring countries, lives in tropical rainforest where rivers, swamps, and flooded terrain are common habitat features. Rescue and rehabilitation records from Malaysian wildlife centres include individuals recovered from rivers and flooded drains, suggesting that water crossings are a routine part of their landscape use. Some researchers have proposed that the relatively arboreal habits of the Sunda pangolin — it climbs readily and uses prehensile tail — may partly reflect an adaptation to navigating fragmented, water-intersected forest.

Chinese Pangolin

The Chinese pangolin (Manis pentadactyla) inhabits hilly, subtropical terrain across southern China and parts of Nepal, India, and Indochina. Rivers and streams are part of this landscape. While detailed swimming observations are rare due to the species' extreme rarity and nocturnal habits, the basic physiological adaptations for buoyancy appear to be shared across the genus, and there is no reason to suppose the Chinese pangolin lacks swimming ability.

Why Pangolins Cross Water

Understanding why pangolins enter water is as important as understanding how they do it. Several drivers have been identified or inferred from tracking data and field observations.

Foraging Range Expansion

Pangolins are dietary specialists, feeding almost exclusively on ants and termites. Their foraging efficiency depends on access to active colonies, which vary in density and location across the landscape. When the near-bank area has been depleted — either by the pangolin itself over previous nights or by competitor species — crossing to fresh foraging ground on the opposite bank offers a direct nutritional benefit. GPS tracking data from South African ground pangolins has shown that individual home ranges frequently straddle water courses, implying regular crossing as part of normal ranging behaviour.

Mate Finding and Breeding Dispersal

Pangolins are largely solitary, and males in particular must cover large distances during the breeding season to locate receptive females. A river that bisects available habitat is a barrier only if the animal cannot cross it. The ability to swim effectively more than doubles the accessible territory for a dispersing male, significantly increasing his chances of finding a mate. In fragmented landscapes where pangolin populations are small and isolated, this capacity for water crossing may be a critical component of genetic connectivity between subpopulations.

Predator Avoidance

While pangolins primarily rely on their scales and rolling behaviour for defence, entering water may occasionally serve as a predator avoidance strategy. Lions, leopards, and hyenas — the primary predators of ground pangolins in southern Africa — are generally reluctant to enter deep water in pursuit of prey. A pangolin that reaches a river ahead of a pursuing predator may effectively end the chase. This is unlikely to be a primary driver of water-crossing behaviour, but it may explain some documented instances of pangolins entering water unexpectedly during the day.

Seasonal Habitat Shifts

In seasonally flooded systems such as the Okavango Delta in Botswana or the floodplains of the Limpopo basin, what is dry land for half the year becomes a network of channels and shallow lakes during the flood season. Pangolins that establish territories in these systems must either move to higher ground or cross water regularly as part of their seasonal ranging. Camera trap studies in the Okavango have documented pangolins navigating partially flooded terrain, apparently untroubled by shallow water.

Swimming and Conservation Management

The pangolin's swimming ability has practical implications for conservation work.

Electric Fence Design

Many pangolin conservation areas in southern Africa are fenced with electric fences to exclude poachers and predators. Standard electric fence designs include bottom strands close to the ground but rarely account for animals crossing at water points where the fence meets a drainage line. A pangolin attempting to cross a river that runs through a fenced reserve may encounter an underwater or low-lying live wire, with potentially fatal consequences. Conservation managers are increasingly aware of the need to design water-crossing points in electric fences that allow wildlife movement without creating electrocution risks.

Rescue and Rehabilitation

Pangolins found in rivers or drainage lines are not necessarily injured or in distress. Rehabilitation centres in South Africa and Malaysia report that rescued animals sometimes present in good condition having apparently entered water voluntarily. Veterinary teams are trained to assess these animals for signs of genuine distress — abnormal respiratory rate, scale damage consistent with drowning struggle, hypothermia — rather than assuming all water-recovered pangolins are in crisis.

Reserve Size and Connectivity

If pangolins cross rivers as a routine part of their ranging behaviour, then reserve boundaries that follow riverbanks do not necessarily contain the animals they are meant to protect. A pangolin centred within a riverside reserve may regularly cross into unprotected land on the opposite bank, where it is vulnerable to snaring, vehicle collision, and poisoning. Reserve planning that accounts for likely crossing points — and seeks to extend protection or at minimum establish buffer zones on both banks — is more likely to achieve effective population protection.

Observations From the Field

The most compelling evidence for pangolin swimming ability comes from direct observation rather than inference. Rangers and researchers working with pangolins in South Africa's Limpopo province and in Botswana's Tuli Block have described watching animals enter rivers without hesitation, swim steadily for distances of 20 to 50 metres, and emerge on the far side to continue foraging within minutes. The animals showed no sign of physical difficulty beyond a brief pause to shake excess water from their scales before moving on.

In the Sabi Sand Game Reserve adjacent to Kruger National Park, camera traps positioned at known pangolin movement corridors have captured sequential images of individual animals at the water's edge, in the water, and on the far bank, confirming single crossing events and allowing researchers to calculate approximate crossing times. Most events recorded took between three and eight minutes for crossings of 15 to 40 metres, indicating a swimming speed of roughly two to ten metres per minute — slow by most vertebrate standards but entirely functional for a heavy, scale-covered mammal.

Threats During Water Crossings

While pangolins can swim, the act of crossing water exposes them to hazards that are absent on land. Crocodiles are present in many of the rivers used by pangolins in Africa and Asia and have been documented predating on a range of small to medium-sized mammals crossing water. Whether crocodiles regularly take pangolins is unknown, but the risk is real. The pangolin's defensive ball curl is ineffective in deep water and would be immediately fatal if deployed mid-crossing.

Flood events present another risk. Pangolins crossing rivers during the early stages of flooding may find the current stronger than anticipated. Animals that lose their footing or are swept downstream may become exhausted or disoriented. Several pangolins rescued from flooded areas in South Africa during the 2000 and 2012 flood events showed signs of exhaustion consistent with extended time in the water, though it is impossible to know whether these animals entered the water voluntarily or were caught by rising floods.

Human infrastructure presents the most serious contemporary threat at water crossings. Low concrete weirs, drainage culverts, and flood-control channels can trap pangolins that enter them during crossing attempts. Smooth-sided drainage infrastructure that lacks footholds prevents exit even for a healthy, uninjured animal, and pangolins found in such structures are frequently in poor condition due to dehydration, hypothermia, or repeated failed escape attempts.

What Pangolin Swimming Tells Us About Resilience

The documented swimming ability of pangolins is a useful reminder that these animals are not as fragile as their conservation status might imply. They are physiologically capable, behaviourally flexible, and able to navigate complex landscapes that include significant water barriers. The crisis pangolins face is not one of biological inadequacy. It is one of human pressure — poaching, habitat loss, and road mortality — applied at a rate that exceeds any species' capacity for natural resilience.

Understanding the full behavioural repertoire of pangolins, including their capacity for water crossing, helps conservation managers design interventions that work with the animals' natural movement patterns rather than against them. A species that swims rivers, climbs trees, excavates burrows, and navigates tens of kilometres of landscape each week is not a passive conservation subject. It is an active participant in its own survival, and it deserves management strategies sophisticated enough to recognise that.