A pangolin walking through the bushveld on a foraging night passes dozens, sometimes hundreds, of termite mounds and ant nests. It does not dig into most of them. This selectivity — investigating far more nests than it ever opens — is one of the more striking and less publicised aspects of pangolin foraging ecology, and it says a great deal about how finely tuned this animal's energy budget really is.
Selectivity as a Survival Strategy
Termite and ant mounds vary enormously in size, age, moisture, structural hardness, and colony activity, and not all of them represent a good energetic bet for a foraging pangolin. Excavating a termite mound, particularly a large, hardened Macrotermes structure, can require sustained, muscular digging effort. If a pangolin spent that effort on every mound it passed, regardless of whether the colony inside was thriving, dormant, or long abandoned, its energy budget would collapse quickly. Selectivity is the behavioural solution: investigate cheaply, dig only when the odds look good.
How Pangolins Assess a Mound Before Digging
Scent-Led Investigation
Pangolins have poor eyesight but an exceptionally well-developed sense of smell, and this is the primary tool used to evaluate a mound before any digging begins. A foraging pangolin will typically approach a mound, sniff at cracks, vents, and surface openings, and move on within seconds if the scent cues suggest low activity or an unproductive colony. Only mounds that pass this initial olfactory screening receive further attention.
Mound Hardness and Moisture
Mound condition affects both how easy a nest is to open and, indirectly, how active the colony inside is likely to be. Very hard, sun-baked mounds in the dry season can be energetically costly to breach even when a colony is present, while mounds with workable moisture content are easier to excavate. This is one reason pangolin foraging effort and success shift seasonally — the same mound can present a very different cost-benefit calculation in the wet season compared with the height of the dry season.
Colony Size and Recent Activity
Larger, more active colonies generally offer a better energy return per mound opened, and pangolins appear able to detect cues associated with colony vigour, likely through a combination of scent intensity and surface activity signs such as fresh mud sheeting or foraging tunnels. Long-abandoned mounds, by contrast, are frequently investigated briefly and then ignored.
The "Taste and Move On" Pattern
Even when a pangolin does commit to opening a mound, it rarely exhausts the colony inside. Field observations consistently describe short foraging bouts at any single nest — often just a minute or two of active feeding — after which the pangolin moves on to the next target rather than continuing to dig deeper into the same structure. This pattern limits exposure to a termite or ant colony's chemical and physical defences, such as soldier castes and biting or chemical deterrents, and appears to leave enough of the colony intact for the mound to be productively revisited on a future foraging night.
This "taste and move on" strategy closely parallels foraging patterns documented in other specialist myrmecophages elsewhere in the world, and is thought to be a convergent solution to the same underlying problem: how to repeatedly exploit a defended, colonial food source without destroying the resource or suffering excessive defensive retaliation in a single visit.
Species-Level and Seasonal Variation
Mound selection strategy is not identical across all pangolin species or contexts. Ground pangolins in more open bushveld and savanna habitat have greater access to large, conspicuous termite mounds and tend to show strong mound-selectivity behaviour, while species foraging in denser vegetation may rely more on surface-active ant trails and smaller, less conspicuous nests where the same energetic logic of quick assessment still applies but the cues used may differ. Seasonal prey availability also reshapes selection pressure: during drought periods, when overall prey density drops, pangolins may be forced to lower their selectivity threshold and accept mounds they would otherwise pass over, a pattern consistent with broader research on how drought conditions squeeze pangolin foraging efficiency.
Why This Matters for Conservation and Research
Understanding mound selection behaviour has practical value beyond natural history curiosity. Researchers studying pangolin home ranges and habitat quality increasingly look not just at overall termite and ant abundance in an area, but at the proportion of mounds that meet the activity, moisture, and structural criteria pangolins actually select for. A habitat with plentiful mounds that are mostly dormant or unsuitably hardened may support far fewer pangolins than a raw termite-density figure would suggest, which has direct implications for how conservationists assess and prioritise habitat for protection or restoration.
Mound Selection Factors at a Glance
| Factor | Effect on Selection |
|---|---|
| Colony activity level | Active, populous colonies are strongly preferred over dormant ones |
| Mound hardness | Very hard, dry-season mounds raise the energetic cost of digging |
| Moisture content | Moderate moisture makes excavation easier and often signals activity |
| Scent cues | Primary tool for pre-dig assessment given limited eyesight |
| Season | Selectivity narrows during drought as overall prey density falls |
FAQ: How Pangolins Select Termite Mounds
Do pangolins dig into every termite mound they find?
No. Tracking studies show ground pangolins investigate far more mounds and nests than they actually open, sniffing many and excavating only a small proportion likely to yield a worthwhile amount of prey.
How do pangolins decide which mound to open?
Mostly through scent. Pangolins use their strong sense of smell to assess colony activity before digging, with mound hardness, moisture, and recent activity level all influencing whether a mound is worth the excavation effort.
Why don't pangolins just eat everything in one mound?
They typically feed briefly at a nest and move on rather than exhausting the colony, limiting exposure to defensive castes and leaving enough of the colony intact to be productively revisited later.
Conclusion
Far from being indiscriminate diggers, ground pangolins operate a careful, scent-driven selection process every time they approach a termite mound or ant nest. That selectivity — investigate cheaply, dig only when the odds favour a good return, feed briefly, and move on — is a quietly sophisticated energy-management strategy, and one that conservationists are increasingly factoring into how they assess whether a given stretch of habitat can actually sustain a healthy pangolin population.