Ground Pangolin Burrow Ecology: Shelter, Safety and Survival
For most of each day, the ground pangolin is invisible. It spends its daylight hours sealed underground in a burrow, coiled into a tight ball with its scaled back facing the entrance and its sensitive nose, eyes and belly protected from the world above. This dependence on underground shelter is not incidental to the species' ecology; it is central to its survival. Understanding ground pangolin burrow ecology means understanding how Smutsia temminckii finds, selects, uses and sometimes shares the subterranean spaces that make its existence in southern African savanna possible.
Research conducted across Limpopo, North West and Mpumalanga provinces has revealed that the availability of suitable burrows directly influences where ground pangolins can establish home ranges. Without adequate underground shelter, the species cannot tolerate the temperature extremes of the southern African interior, cannot effectively evade predators and cannot raise young through the most vulnerable stages of their development. The ground pangolin burrow is, in short, as ecologically important as food and water.
Burrow Construction and Selection
Primary Excavators and Secondary Occupants
Temminck's ground pangolin is not a primary burrowing animal. Unlike the aardvark (Orycteropus afer), which routinely excavates large, complex underground systems as part of its nightly foraging, the ground pangolin lacks the body mass, forelimb structure and behavioural drive to dig entirely new burrow systems from scratch. It is instead a highly effective secondary occupant, identifying and moving into shelters created by other species.
The aardvark is by far the most important supplier of pangolin underground shelter across the savanna biome. Aardvarks dig prolifically: a single individual may excavate dozens of burrows within its home range, abandoning most of them after brief use and creating a landscape-level network of available shelters. Ground pangolins in tracking studies across Limpopo and the Kalahari have been shown to rotate through multiple aardvark burrows within their home ranges, rarely spending consecutive days in the same location. This mobility between shelters may reduce parasite load and decrease predictability to predators.
Porcupines (Hystrix africaeaustralis) are a secondary but meaningful source of pangolin underground shelter, particularly in rocky terrain or areas where aardvarks are locally scarce. Porcupine burrows tend to be shallower and narrower than aardvark excavations, and they are sometimes used simultaneously by porcupines, which are primarily nocturnal and vacate their dens at the same time the pangolin is out foraging.
Pangolin Digging Capacity
Although ground pangolins are not primary excavators, they are not passive either. Field observations have recorded individuals widening burrow entrances, clearing loose soil from tunnel mouths and, in some instances, digging short extensions to existing burrow systems. The curved, robust claws that serve so effectively as tools for raking open termite mounds are capable of moving soil, and pangolins will invest limited digging effort to make a burrow entrance fit their body dimensions or to collapse an entrance behind them for additional security.
This partial digging behaviour is most commonly observed when a pangolin needs to seal itself in. By pulling loose soil against the inside of the entrance as it enters, an individual can effectively block its own burrow, making detection from outside significantly more difficult.
Pangolin Burrow Depth and Structure
Pangolin burrow depth varies considerably depending on the original excavator, the substrate and the local topography. In loose Kalahari sand, aardvark burrows descend steeply and may reach a terminal chamber at 1.5 to 2 metres or more below the surface. In the harder clay and loam soils of the Lowveld and Bushveld, burrows may be shallower, with the main chamber at around 0.5 to 1 metre depth. The key ecological variable is not absolute depth but thermal insulation: the chamber must sit deep enough that it decouples from surface temperature variation.
A typical aardvark-origin burrow used by ground pangolins consists of:
- A main entrance tunnel, angled steeply downward and wide enough to admit the pangolin's curled body
- A mid-tunnel section that may branch or bend, reducing direct line-of-sight from the entrance to the chamber
- A terminal chamber, usually rounded and large enough for the pangolin to turn around or lie extended
Burrows are generally not lined with vegetation. Unlike many small mammals, ground pangolins do not import nesting material. The chamber walls are bare compacted earth, and the animal's own scaled body provides sufficient insulation for thermal regulation during rest periods.
Thermoregulation Underground
Southern Africa's savanna climate imposes significant thermal challenges. Midday surface temperatures in the Limpopo bushveld regularly exceed 35 degrees Celsius in summer, and winter nights in the Kalahari can drop below zero. The ground pangolin is a mammal with a relatively low basal metabolic rate, and it cannot sustain prolonged exposure to temperature extremes without physiological cost.
The burrow environment solves this problem with remarkable efficiency. Soil temperature below approximately 50 centimetres is buffered from daily fluctuations, and below one metre it tracks seasonal average temperatures rather than daily highs and lows. A pangolin resting in a chamber at 1.5 metres depth on a 38-degree summer afternoon may be experiencing an ambient temperature of 24 to 26 degrees, a difference that substantially reduces water loss and metabolic stress.
In winter, the same thermal mass effect keeps the burrow warmer than the night-time surface. Pangolins tracked through Kalahari winters have been shown to alter their daytime shelter selection, favouring burrows with north-facing entrances that absorb more solar radiation during the day and retain that heat into the evening. This micro-scale habitat selection behaviour demonstrates a level of environmental sensitivity that has practical implications for Temminck's pangolin habitat quality assessment.
Seasonal Shifts in Burrow Use
Burrow selection is not static across the year. In summer, when surface temperatures peak and food is relatively abundant, pangolins tend to use deeper, better-insulated chambers and may spend up to 20 hours per day underground. In winter, foraging windows are longer relative to active hours, and pangolins sometimes use shallower, more exposed shelters, particularly in the early evening and early morning when ambient warmth matters more than daytime cooling. The seasonal plasticity of Temminck's pangolin habitat use is an underappreciated aspect of its ecology and one that has direct relevance to assessing habitat suitability in areas considered for reintroduction.
Sharing Burrows with Aardvarks and Other Species
The relationship between ground pangolins and aardvarks is one of the most ecologically significant interspecies dependencies in southern African wildlife. Aardvarks function as ecosystem engineers, and their extensive burrowing activity creates underground infrastructure used by an entire community of secondary occupants, including pangolins, warthogs (Phacochoerus africanus), bat-eared foxes (Otocyon megalotis), honey badgers (Mellivora capensis), monitor lizards and various owl species.
Ground pangolins and aardvarks are generally not recorded sharing the same burrow at the same time. Their activity patterns partially separate them: aardvarks are among the most strictly nocturnal mammals in the African savanna, emerging after dark and returning before dawn, while pangolins follow a similar schedule. The result is that both species may use the same burrow system but typically in temporal rather than spatial separation. A pangolin occupying a chamber at the terminal end of a large aardvark burrow network during the day is unlikely to encounter the aardvark, which may be resting in a different branch of the same system or in an entirely separate burrow.
The conservation implication is significant. Any landscape-level decline in aardvark populations directly reduces the availability of pangolin underground shelter in savanna ecosystems. Aardvark numbers have declined in areas heavily affected by snaring, and the loss of this ecosystem engineer function has ripple effects for the species that depend on its excavations. Maintaining healthy aardvark populations is therefore an indirect but essential component of Temminck's pangolin habitat management.
Burrows as Refuge from Predators
The ground pangolin's primary anti-predator strategy is its ability to roll into a tight, scale-armoured ball. This passive defence is highly effective against most carnivores, but it is most effective when combined with the physical barrier of a burrow entrance. An individual that detects danger while underground has a decisive advantage over one that must curl in the open.
Field observations and camera trap data from reserves in Limpopo and the greater Kruger ecosystem have documented predator interest in occupied ground pangolin burrows from lions (Panthera leo), leopards (Panthera pardus) and spotted hyenas (Crocuta crocuta). In most recorded cases, predators investigate the burrow entrance, pause, and withdraw without successful extraction of the pangolin. The narrow entrance geometry of many aardvark-origin burrows physically prevents large carnivores from entering, and a pangolin wedged into a terminal chamber with its scaled back facing the entrance can resist extraction by animals considerably stronger than itself.
Spotted hyenas are theoretically capable of excavating soft-soil burrows, and there are anecdotal records of hyenas digging into aardvark burrow systems. However, persistent excavation to reach a pangolin is energetically costly and rarely observed in practice. The combination of burrow depth, the physical barrier of a rolled pangolin and the energetic economics of predation means that the ground pangolin burrow functions as an effective last-resort refuge even against the largest predators in its range.
Burrows and Pangolin Reproduction
Female ground pangolins give birth to a single offspring (pangopup) and carry the young animal on their tail for the first weeks of life. As the pangopup grows, the burrow becomes its primary place of refuge during periods when the mother is foraging. Young pangolins are left underground while the female moves to forage, and they rely on the thermal and physical protection of the chamber until they are old enough to accompany her. The quality and security of the burrow used during this period is likely to have a direct bearing on offspring survival, though detailed studies of ground pangolin burrow use during the rearing period remain limited by the difficulty of observing this behaviour non-invasively.
Conservation Significance of Burrow Availability
The availability of adequate underground shelter is a habitat quality criterion that is sometimes overlooked in assessments of potential pangolin reintroduction sites. Vegetation structure, prey density and human disturbance are typically evaluated, but the density and condition of existing burrow networks is equally important. A landscape that supports a healthy aardvark population will, all else being equal, provide substantially better pangolin underground shelter than one where aardvarks have been reduced by poaching or land-use change.
Conservation organisations working on ground pangolin recovery in South Africa, including those supporting reintroduction programmes in the Limpopo and North West provinces, increasingly incorporate burrow availability mapping into habitat assessments. Remote sensing approaches that identify areas of disturbed soil characteristic of active aardvark digging have shown promise as a proxy for burrow availability at landscape scale, reducing the fieldwork burden of direct burrow surveys across large, difficult terrain.
Frequently Asked Questions
How deep is a ground pangolin burrow?
Ground pangolin burrows typically descend between 0.5 and 2 metres below the surface, though depth depends heavily on soil type and whether the burrow was originally excavated by an aardvark. Aardvark-dug burrows tend to be considerably deeper, with the main chamber sometimes reaching 2 metres or more. Pangolins select for systems where the terminal chamber sits below the depth at which daily temperature fluctuations penetrate the soil, providing a thermally stable refuge.
Do ground pangolins dig their own burrows?
Temminck's ground pangolin is capable of digging and individuals have been observed enlarging or partially excavating burrow entrances. However, they are not primary excavators. They rely predominantly on burrows dug by aardvarks (Orycteropus afer) and, to a lesser extent, by porcupines (Hystrix africaeaustralis). This dependence on secondary burrow use makes the ecological relationship between ground pangolins and aardvarks particularly significant for conservation planning across southern Africa.
Do pangolins share burrows with other animals?
Yes. Ground pangolins regularly occupy burrows that are also used by other species, most notably aardvarks. These burrow systems are often large enough to shelter multiple animals, though pangolins tend to use vacant chambers and generally do not occupy a burrow at the same time as an aardvark. Warthogs, bat-eared foxes, honey badgers and various reptile species are also recorded in the same burrow networks, making these underground structures important shared infrastructure for southern African wildlife communities.
How does a burrow protect the ground pangolin from predators?
A burrow provides physical protection that complements the pangolin's defensive rolling behaviour. Once inside a burrow, a pangolin that rolls into a ball blocks the tunnel with its armoured, scaled back and tail, making extraction extremely difficult even for large predators such as lions and leopards. The narrow entrance of many burrow systems physically limits the ability of large carnivores to enter. Hyenas that could theoretically excavate a burrow seldom invest the sustained effort required, making underground shelter one of the most effective anti-predator strategies available to the species.
The ground pangolin burrow is far more than a place to sleep. It is a thermal refuge, a predator deterrent, a nursery and a navigational anchor within a home range that may extend across many square kilometres of southern African savanna. The ecological web connecting Smutsia temminckii to aardvarks, to soil type, to seasonal temperature patterns and to the structure of the burrow itself underscores how conservation of this species must address the entire system it inhabits, not the animal in isolation. For anyone researching Temminck's pangolin habitat or involved in reintroduction planning, underground shelter availability deserves the same analytical attention as food resources and predator pressure.