Pangolin Swimming and Water Behaviour Explained
Pangolins have a reputation as secretive, nocturnal wanderers of scrub and savanna, but their relationship with water is one of the least discussed aspects of their biology. These scaly mammals do enter water voluntarily, they can swim with surprising competence, and their bodies carry several features that make aquatic crossings possible even if not comfortable. Understanding pangolin swimming behaviour sheds light on home range use, thermoregulation, and the ecological pressures that shape movement decisions.
Can Pangolins Actually Swim?
The short answer is yes. Field observations across sub-Saharan Africa and Asia confirm that pangolins cross rivers and streams under their own power. Ground pangolins (Smutsia temminckii) and tree pangolins (Phataginus tricuspis) have both been recorded entering water intentionally rather than accidentally. The behaviour is not an emergency response to flooding alone — pangolins occasionally choose aquatic routes even when terrestrial alternatives exist nearby.
Buoyancy is the key factor that makes pangolin swimming viable. Their overlapping keratin scales trap a layer of air against the body, creating a natural flotation assist. A pangolin in water does not thrash or panic; it adopts a slow, deliberate paddling motion using all four limbs, with the tail held relatively straight and the head angled upward. Observers describe the swimming posture as unhurried, consistent with an animal that is not fighting its environment but navigating it.
Buoyancy and the Role of Scales
Keratin scales cover roughly 20 percent of a pangolin's body surface and overlap like roof tiles. When a pangolin enters water the scales do not seal flat against the skin immediately — they retain small air pockets that reduce effective body density. This is somewhat analogous to the way a wetsuit traps water against the skin for insulation, except that pangolin scales trap air rather than water, and that air provides genuine uplift.
The belly of a pangolin is unscaled, covered instead with coarse hair. This ventral surface is denser and absorbs water readily, which means a swimming pangolin is not perfectly balanced. The animal compensates by arching its spine slightly and keeping its tail elevated. In practice this means pangolins swim with a gentle list and with the scaled dorsal surface riding clear of the waterline.
Do Scales Become Waterlogged?
Keratin is not fully hydrophobic but it is highly water-resistant under short exposure. Short swims of ten to thirty metres — the kind required to cross a seasonal drainage channel — do not appear to waterlog the scales or add significant weight. Longer immersion times have not been rigorously studied, and it is unknown at what point scale saturation would begin to impair buoyancy. In practice, pangolins do not linger in water; they cross efficiently and exit as soon as they reach the far bank.
Why Do Pangolins Enter Water?
Home Range Navigation
Ground pangolin home ranges in Botswana and Zimbabwe frequently span both sides of seasonal rivers. Radio-tracking studies have recorded individuals crossing the same watercourse multiple times within a single season, indicating that the river is not a barrier to movement but simply a feature to be negotiated. Pangolins appear to select crossing points where banks are shallow, current is weak, and the crossing distance is minimised — behaviour consistent with deliberate route planning rather than accidental immersion.
Foraging Pressure
Ant and termite colony density on one side of a river can differ substantially from the other side, particularly after fire or heavy rain disturbs insect activity on one bank. A pangolin that learns a productive foraging site is located across a stream may choose to cross regularly rather than abandon the resource. Food availability is the primary driver of most pangolin movement decisions, and water crossings are no exception.
Predator Avoidance
Lions, leopards, and hyenas avoid water crossings when alternative routes exist. A pangolin that reaches a riverbank with a predator in pursuit may enter the water as an escape strategy. Once in the water the pangolin's curl-and-sink defence — tucking into a ball — is less effective, but the aquatic environment itself provides a degree of protection because most pursuit predators are reluctant to follow. There are anecdotal field reports of pangolins entering water when disturbed by large carnivores, though systematic evidence for predator-driven water entry remains sparse.
Drinking Behaviour
Pangolins obtain most of their water from prey insects, particularly ants whose bodies contain substantial moisture. However, ground pangolins have been filmed drinking directly from pools and stream margins in the dry season, when insect moisture content drops and free water becomes more valuable. Drinking posture is awkward: the animal stands at the water's edge, lowers its long snout to the surface, and laps rapidly with its tongue. The same tongue adapted for extracting ants from narrow galleries works efficiently as a liquid-acquisition tool.
Seasonal Water Proximity
Studies of pangolin den-site selection in dry woodland show a modest but consistent preference for locations within two kilometres of permanent water. This proximity may serve both drinking needs and thermoregulatory needs — moist microhabitats around water bodies tend to remain cooler during peak afternoon heat, reducing the metabolic cost of maintaining body temperature. Pangolins are poorly equipped for active thermoregulation and rely heavily on behavioural strategies including microhabitat selection.
Thermoregulation and Water
Unlike many mammals, pangolins cannot pant effectively or sweat through specialised glands. Their primary thermoregulatory tools are nocturnal activity, den retreats during the heat of the day, and selection of cool microhabitats. Moist soil near streams stays cooler than dry sand by several degrees Celsius, and pangolins exploit this gradient by foraging along riparian corridors during cooler evening hours.
There is limited but intriguing evidence that pangolins may wade into shallow water for cooling during heat stress events, though this behaviour has not been formally documented under controlled conditions. Given their thermal constraints and the documented willingness to enter water for other purposes, opportunistic thermoregulatory wading would not be surprising.
Tree Pangolins and Flooded Canopy
The smaller arboreal species face a different water challenge. In Central and West African rainforests, seasonal flooding can inundate the lower canopy and forest floor for weeks. Tree pangolins (Phataginus tricuspis) respond by remaining in the upper canopy and extending the arboreal portion of their foraging behaviour. Individuals tracked during flood events show reduced ground-level activity and increased reliance on epiphytic ant colonies in the upper branches.
When tree pangolins must descend during partial flooding, they have been observed crossing shallow flooded areas by wading rather than swimming — keeping the body clear of the waterline and relying on their strong grip to negotiate submerged roots and debris. Full swimming behaviour in tree pangolins is recorded but rare.
Research Gaps and Conservation Relevance
Pangolin aquatic behaviour remains one of the most understudied aspects of their ecology. Key questions without adequate data include: what minimum river width constitutes a genuine barrier to movement, whether juveniles swim as readily as adults, and whether stream crossing frequency differs between wet and dry seasons in ways that influence genetic connectivity between sub-populations.
These questions matter for conservation because infrastructure projects — roads, dams, irrigation channels — can fragment pangolin habitat in ways that are not captured by simple land-cover analysis. A three-metre irrigation canal with steep concrete walls may be a more effective barrier to pangolin movement than a twenty-metre natural stream with shallow banks, even though the canal is narrower. Understanding how pangolins interact with water in the wild is therefore a prerequisite for designing infrastructure that does not inadvertently isolate populations.
Summary
Pangolins are capable swimmers whose scale-assisted buoyancy allows them to cross rivers and streams as part of routine home range use. They drink directly from surface water when insect moisture is insufficient and show behavioural preferences for riparian microhabitats that offer cooler temperatures. Aquatic behaviour in pangolins is purposeful and ecologically integrated rather than incidental. Future research tracking fine-scale movement relative to water features will clarify the role of rivers as connectors or barriers in pangolin landscape ecology and improve conservation planning for a group of animals already under severe poaching pressure.