How Pangolins Communicate Using Scent Glands
Pangolins are among the quietest animals in Africa. They do not bark, roar, chirp or sing. A threatened pangolin might produce a low hiss or a soft puffing sound, but these vocalisations are rare and limited in information content. Yet pangolins are not isolated individuals living in communication blackouts. They maintain awareness of neighbours, identify potential mates, defend territories and time reproduction — all without uttering a sound. The mechanism is scent, delivered through one of the most powerful odour-producing systems found in any African mammal.
Anatomy of the Pangolin Scent Gland
All eight pangolin species possess large paired anal scent glands, and the ground pangolin (Smutsia temminckii) of southern Africa is no exception. These glands are situated on either side of the cloaca and open externally through pores near the base of the tail. In adults the glands are substantial organs, proportionally larger relative to body size than the musk glands found in most other African carnivores and omnivores.
The secretion produced is a viscous, strongly odorous compound. Researchers who have worked closely with ground pangolins describe the smell as sharp, musky and persistent — detectable to the human nose at considerable distance from a fresh mark. The exact chemical composition varies between individuals and between sexes, which is central to how the communication system works. Each pangolin produces a chemically unique signature that other pangolins can read.
Pangolins also have small glands associated with the skin between their scales, but it is the anal glands that produce the bulk of communication-relevant secretions. Unlike the skunk (Mephitis mephitis), which can spray its musk directionally as a defence weapon, pangolins deposit their secretion by contact marking rather than projection.
How Pangolins Deposit Scent Marks
The primary marking behaviour involves the pangolin lowering its hindquarters and rubbing the anal region against a solid substrate. In South African savanna habitat, the preferred marking objects are tree trunks, termite mound surfaces, large rocks and the bases of fence posts. These structures are prominent, elevated above the surrounding ground surface and stable — qualities that maximise the longevity and detectability of the mark.
Urine is used as a secondary marking medium. Pangolins frequently urinate at or near scent-marked sites, adding a volatile chemical layer to the longer-lasting glandular deposit. The combination of glandular secretion and urine provides both an immediate olfactory signal, detectable when fresh, and a persistent background signal that fades more slowly.
Defecation at specific latrine sites adds a third communication channel. Unlike many mammals that defecate randomly while foraging, pangolins in well-studied populations show a tendency to use repeated sites. These latrines accumulate scent information over weeks and appear to function as information hubs, visited by multiple individuals within an overlapping range area.
The frequency of marking increases substantially in males during the mating season. A radio-collared male in Limpopo province was observed to interrupt foraging repeatedly during mating season to mark at sites along the perimeter of his range, behaviour that was largely absent during the dry season when females were not in oestrus.
The Information Encoded in Scent
Chemical communication is often described as simple or primitive compared to visual or acoustic signalling, but for pangolins it carries remarkable information density. Research on related scent-marking mammals and preliminary work on pangolins themselves suggests that a single scent mark can convey several distinct categories of information simultaneously.
- Individual identity: Each pangolin's chemical signature is distinct. A resident pangolin that detects a strange mark at a familiar site can assess whether the intruder is known or unfamiliar, and whether it is the same individual that marked the site previously.
- Sex: Males and females produce detectably different secretion profiles. This allows immediate sex identification without visual contact, which is significant for animals that may never encounter each other directly.
- Reproductive status: Females in oestrus produce scent marks with altered chemical composition. Males can detect this change and will travel considerable distances to follow a reproductive female's trail. This is the primary mechanism by which solitary pangolins locate mates across large home ranges.
- Temporal information: The ratio of volatile to non-volatile compounds in a scent mark changes predictably as the mark ages. An experienced pangolin can assess roughly how recently a site was marked, distinguishing a mark placed that night from one placed several nights prior.
- Body condition: There is emerging evidence from scent-marking mammals more broadly that glandular secretion composition reflects the marker's nutritional and health status. Whether pangolins read and act on this information remains an open research question.
Scent Communication and Home Range Dynamics
Ground pangolins in southern Africa are not strictly territorial in the sense that they vigorously exclude all other individuals from a defended area. Radio-tracking studies in Limpopo, the Tswalu Kalahari Reserve and parts of the Northern Cape show that home ranges overlap substantially, particularly between males. What scent marking appears to regulate is the timing and spacing of visits to shared areas, rather than outright exclusion.
This is sometimes called a time-share system. Multiple pangolins may use the same termite mound complex and the same foraging corridors, but they stagger their visits based on scent information. When one individual detects a fresh mark from a neighbour, it may redirect its path or delay its visit to that area. The result is effective resource partitioning without the energetic cost of direct confrontation.
Males maintaining larger ranges than females — a pattern documented in pangolin populations across southern Africa — are under greater pressure to monitor and refresh marks across wider areas. During the mating season, which in South Africa peaks between May and September, males extend their effective range substantially while following female scent trails. A male may travel two to three times his normal nightly distance during peak mating activity.
Scent Glands as a Secondary Defence
The anal glands serve a secondary function that is distinct from communication: they contribute to the pangolin's defensive arsenal. When a pangolin is physically handled by a predator that has succeeded in unrolling it, or when it is caught in a trap, it may express the glands forcefully. The sudden release of concentrated musk at close range is aversive to most predators and may provide a critical few seconds for the pangolin to re-curl or escape.
Field researchers and rehabilitation workers frequently report this defensive expression during handling, particularly during initial capture of wild individuals. The smell persists on clothing for days and is resistant to washing. This robustness is itself an adaptive feature — communication marks need to persist in the environment long after the pangolin has moved on.
Implications for Research and Conservation
Understanding pangolin scent communication has practical consequences for conservation science. Camera traps, the standard tool for wildlife monitoring, capture visual images but miss the bulk of pangolin communication activity, which occurs through olfactory channels that cameras cannot record. A pangolin that stops at a marking site, sniffs for several seconds, and moves on will appear on camera as brief, unremarkable footage. The information exchange that actually occurred is invisible to the instrument.
Hair snare stations positioned near known marking sites offer one solution. Pangolins that rub against adhesive-coated surfaces leave hair samples for DNA analysis, enabling population genetics work without capture. Tracking dogs trained to follow scent trails can identify marking networks across landscapes, helping researchers understand connectivity between pangolin subpopulations in fragmented habitats.
For anti-poaching operations, scent biology matters in a different way. Trained detection dogs can locate pangolins hidden in vehicle compartments or storage containers at far greater sensitivity than any electronic sensor currently available. Understanding that pangolins produce potent, persistent musk — and that they may express their glands under stress — informs the design of detection protocols at border posts and transit hubs.
Research note: The chemical ecology of pangolin scent glands remains poorly studied compared to other scent-marking mammals. Most published data comes from captive animals or opportunistic sampling of wild individuals during rehabilitation. Systematic field studies of scent-marking behaviour in free-ranging South African ground pangolins are an active research priority.
The pangolin's silence is deceptive. These animals are constantly communicating, leaving layered messages on every prominent surface they pass. Reading that chemical language is beyond human sensory capacity, but the information it carries is sophisticated enough to coordinate the social lives of animals spread across tens of thousands of hectares of African bush without any of them ever having to see or hear another of their kind.