Pangolin Locomotion and Biomechanics: How They Move

Published 19 June 2026 • AlphaPanga Research

The pangolin body plan is a study in trade-offs. Every structural feature that makes a pangolin an effective digger, an armoured defensive ball, or a specialised insectivore imposes costs on other aspects of its movement through the world. Understanding pangolin locomotion — how they walk, dig, climb, curl, and carry themselves through the African bush — reveals both the ingenuity of evolutionary biomechanics and the constraints that define the animal's ecological niche.

South Africa's ground pangolin (Smutsia temminckii) is a predominantly terrestrial species, spending its nights traversing the savanna and bushveld of Limpopo, the North West Province, and parts of the Karoo. Tracking data from GPS-fitted animals in the Tswalu Kalahari Reserve and the Malilangwe Wildlife Reserve in Zimbabwe have given researchers a detailed picture of how far these animals travel and how their locomotion patterns vary across seasons, habitats, and behavioural contexts.

Quadrupedal Walking: An Unusual Gait

Pangolins are quadrupeds, but their walking gait is far from conventional. The most distinctive feature is how the forefeet are placed: the large, curved claws of the front feet are folded inward and upward during walking, so that the animal walks on the outer edge of its curled fist rather than on the sole of its foot. This knuckle-walking posture for the forelimb is unique among living mammals and is a direct consequence of the claw morphology required for powerful digging.

The hindlimbs are more conventional in their placement, with the sole of the foot making broader contact with the ground. This asymmetry between fore and hind limb ground contact creates a distinctive shuffling motion visible in field observations and camera trap footage. The centre of mass is shifted rearward compared to a typical quadruped of similar body mass, partly because the tail — which in an adult ground pangolin can account for a substantial fraction of total body length — acts as a counterbalance during walking.

Gait Analysis

High-speed video analysis of captive pangolins has been used to characterise the precise sequence of footfalls during walking. Ground pangolins use a lateral sequence walk — the standard mammalian walking pattern — at slow speeds, but shift to a diagonal sequence at faster movement. Maximum walking speed in adults is modest, typically around 3–5 kilometres per hour on flat terrain, which reflects the priority placed by the body plan on digging power and scale-carrying overhead rather than speed.

Running in the strict biomechanical sense — where all feet are off the ground simultaneously during a flight phase — has been recorded in pangolins startled by predators, but it is unusual and brief. The primary escape response is not flight but defensive curling, and the locomotor system is clearly not optimised for sustained fast movement.

Bipedal Locomotion

One of the more visually striking aspects of pangolin locomotion is their occasional use of bipedal walking — moving on the hindlimbs alone with the forelimbs and tail raised clear of the ground. This has been observed in wild ground pangolins in South Africa and Botswana, and is particularly documented during movement through tall grass, when the animal appears to use bipedal posture to improve visibility ahead.

The biomechanical basis for pangolin bipedalism is the same rearward centre-of-mass position that characterises their quadrupedal gait. Because the heavy, scale-laden tail and the rearward distribution of body mass already place the gravitational centre of mass close to the hindlimb support base, relatively little additional muscular effort is required to balance on the hindlimbs. Some researchers have proposed that bipedal walking in pangolins may represent a retained ancestral feature from a lineage that experimented with more upright posture, though this hypothesis is contested.

Digging: The Primary Forelimb Function

The forelimbs of pangolins are massively built relative to body mass, with robust humeri, dense cortical bone in the forearm, and enlarged muscle attachment sites for the flexors and extensors of the wrist and digits. These adaptations all serve a single primary function: the excavation of burrows and the opening of termite mounds and ant nests.

Claw Morphology and Force Production

The claws of the ground pangolin are among the most powerful digging tools in the African mammal fauna relative to body size. They are strongly recurved, laterally compressed, and keratinised to a hardness that resists wear against soil and rock. Force plate measurements of digging pangolins in semi-captive conditions have recorded ground reaction forces at the claw tip exceeding several times the animal's body weight during active excavation, generated through the combined action of shoulder, elbow, and wrist musculature operating in a short-lever, high-force configuration.

The technique varies with substrate. In loose sandy soils, typical of the Kalahari system where Tswalu is located, pangolins use rapid alternating strokes of the forelimbs to displace material sideways. In harder clay or compacted earth, the stroke pattern shifts to a more deliberate, single-limb drive that allows greater force concentration at a single point. Termite mound excavation, which requires penetrating extremely hard, cemented soil material, involves the most forceful digging, with the entire forelimb and shoulder girdle participating in each stroke.

Hindlimb Role in Digging

The hindlimbs are not passive during digging. They provide the bracing force that allows the forelimbs to exert large horizontal forces without the animal being pushed backward. The hindfoot claws also play a role in clearing loosened material from the excavation site, and in backward digging — where the animal moves into a burrow it is simultaneously constructing — the hindlimbs do much of the backward displacement of material. This coordinated fore-hind digging pattern is similar to that seen in other fossorial mammals such as aardvarks, which occupy a similar ecological niche in African savannas.

The Defensive Curl: Biomechanics of Rolling Up

The pangolin's signature defensive behaviour — curling into a tight ball when threatened — is a precisely engineered postural response that requires coordination across the entire musculoskeletal system. Understanding how the curl works biomechanically illuminates both the scale architecture discussed elsewhere and the specific adaptations of the pangolin skeleton and musculature.

Spinal Flexibility and Muscle Architecture

The pangolin spine is highly flexible in flexion (curling) relative to extension (straightening). The vertebral column has a large number of thoracolumbar vertebrae with reduced epaxial muscle mass compared to the hypaxial (ventral) muscles, creating an asymmetric arrangement that biases the trunk towards flexion — exactly what is needed to curl rapidly into a ball. The zygapophyseal joints (the facets between adjacent vertebrae) are oriented to permit large-amplitude flexion while limiting rotation, which would be destabilising in a curled posture.

When a pangolin curls, the head is drawn toward the ventral thorax, the hindlimbs are folded against the abdomen, and the tail is wrapped around the outside of the ball, covering the head and face. This positioning ensures that the scaled dorsal surface forms a continuous armoured shell with no exposed gaps larger than the overlap between adjacent scales. The tail's role as a protective cover for the face means that its musculature and skeletal flexibility have been shaped by the same selective pressures as the defensive curl itself.

Maintaining the Ball Posture

Once curled, the pangolin maintains the ball posture through active muscular contraction rather than passive locking. Studies of muscle fatigue in curled pangolins indicate that they can maintain the posture for extended periods — hours, if the threat persists — with the abdominal muscles bearing the primary load of holding the trunk in full flexion. The tail's wrapping creates additional mechanical constraint, as the scaled tail surface interlocks with the dorsal body scales, providing some passive resistance to being forcibly uncurled.

Anecdotal reports from field researchers in South Africa describe lions and leopards working for 10–20 minutes to uncurl a pangolin, and typically failing. The ball posture is remarkably effective against even large predators.

Climbing in Ground Pangolins

Despite being classified as ground-dwelling, the South African ground pangolin is capable of climbing, and this behaviour has been documented both in wild animals ascending rocky outcrops and in semi-captive animals exploring enclosure structures. The forelimb claws that serve so well for digging also provide effective purchase on rough rock surfaces and tree bark, and the gripping ability of the hindfoot allows four-point contact on near-vertical surfaces.

Climbing behaviour in wild ground pangolins appears to be infrequent and associated with specific contexts: reaching elevated termite galleries, investigating tree cavities used as temporary shelter, or, in some recorded instances, escaping from pursuit. The locomotor mechanics of climbing in this species have not been formally studied to the same degree as digging or walking, but the general principle is that the same limb architecture that enables powerful digging provides the force production needed to haul a heavy, scale-laden body up a slope.

Tail Function in Locomotion

The tail of the ground pangolin is longer than the trunk in adults and serves multiple locomotor functions beyond its role in defensive curling. During walking, it is held low and used as a dynamic counterbalance, swinging slightly opposite to the movement of the forelimbs in a manner that helps stabilise the trunk against rotational forces. During digging, the tail may be pressed against the substrate to provide additional bracing.

The tail is also used as a prop during stationary investigation: pangolins adopting a bipedal sniffing posture often rest the tail base against the ground in a tripod configuration, distributing body weight between the two hindlimbs and the tail and freeing the head for olfactory investigation of the environment. This tripod posture is also used during feeding at open termite galleries, when the animal needs to hold position while applying digging force with the forelimbs.

Energetics of Pangolin Movement

The metabolic cost of pangolin locomotion has not been measured directly with the precision available for more tractable study species, but indirect estimates based on daily movement distances and field metabolic rates suggest that pangolins have a relatively low cost of transport for their body mass. This is consistent with their slow walking speed, which minimises the energetic cost per unit distance at the expense of throughput — appropriate for a predator of stationary, high-density prey items like termite mounds that do not need to be chased.

GPS tracking data from ground pangolins in the Tswalu Kalahari Reserve show nightly movement distances typically ranging from 2 to 8 kilometres, with occasional longer excursions. The energetic return from a productive termite mound can fuel several nights of movement, making the spatial strategy of ranging widely to locate high-quality mounds energetically sound despite the relatively high mass the animal must carry.

Biomechanics and Conservation Relevance

Understanding pangolin locomotion has practical implications for conservation and rehabilitation. Animals rescued from wire snares frequently have forelimb injuries — cuts, fractures, or tendon damage — that directly compromise their ability to dig and, therefore, to feed. Assessing limb function before release is a standard component of rehabilitation protocols in South Africa, and the specific muscles and tendons most important for digging are now better understood through the biomechanical literature, guiding targeted veterinary assessment.

Habitat quality assessments also benefit from locomotion knowledge. Pangolins in fragmented or degraded landscapes must cross longer distances between feeding sites, potentially increasing the energetic cost of foraging and reducing reproductive success. Road infrastructure is a particular concern: pangolins attempting to cross roads are slow and exposed, and vehicle collision is a documented mortality cause in South Africa, particularly on roads crossing known pangolin habitat in Limpopo and the North West Province.

Conclusion

The pangolin moves through its world in ways shaped by millions of years of selection for digging power, armoured defence, and specialised insectivory. Its knuckle-walking gait, its bipedal excursions, its explosive digging force, and its precisely engineered defensive curl are all expressions of a body plan that has prioritised effectiveness in a specific ecological role over generalised versatility.

That body plan is poorly suited to the challenges of snare entanglement, road crossing, and captive rehabilitation — the consequences of human activity that increasingly define the pangolin's existence in South Africa. Knowing how the animal is built, and what it needs its body to do, is the first step toward giving it the conditions it needs to survive.