The aardvark is one of evolution's most singular survivors: the sole living member of the mammalian order Tubulidentata, an ancient African lineage with no close living relatives [Lehmann 2009]. Nocturnal, secretive, and powerfully built for digging, this myrmecophagous mammal feeds almost exclusively on ants and termites and excavates extensive burrow systems across sub-Saharan Africa. Those burrows make the aardvark a keystone ecosystem engineer — a single animal whose abandoned diggings provide shelter and breeding sites for dozens of other species [Haussmann et al. 2018; Rey et al. 2017]. This profile examines the aardvark's distinctive biology, its range, and the emerging climate-driven pressures that recent physiological research has documented.
Biology and Identification
The aardvark is a medium-large, pig-like mammal with an arched back, a long tubular snout, elongated ears, and a thick muscular tail. Adults typically weigh 40–65 kg and measure roughly 105–130 cm in head-and-body length, with a tail adding a further 55–60 cm [Shoshani et al. 1988]. The sparse, bristly coat ranges from yellowish-grey to reddish-brown, often stained by the soils in which the animal digs.
The species takes its ordinal name, Tubulidentata ("tube-toothed"), from its uniquely structured teeth: columns of hexagonal dentine tubules, lacking enamel and growing continuously, unlike those of any other living mammal [Lehmann 2009]. The limbs are short and powerful, the forefeet bearing spade-like claws that allow the aardvark to break into hardened termite mounds and excavate at remarkable speed.
Aardvarks are obligate myrmecophages. They locate ant and termite colonies largely by smell, then use a long, sticky tongue to extract prey, consuming tens of thousands of insects in a single night [Taylor et al. 2002]. The species is overwhelmingly nocturnal and solitary. Home-range and activity studies in the South African Karoo recorded individuals using multiple burrows within large home ranges, with movements shaped strongly by the distribution of prey [Taylor & Skinner 2003].
Habitat and Range
The aardvark is broadly distributed across sub-Saharan Africa, occurring from savanna and grassland to woodland, scrub, and semi-arid landscapes wherever ants and termites are sufficiently abundant and the soil is suitable for digging [Taylor & Lehmann 2015]. The species is absent only from true desert interiors, dense tropical rainforest, and areas of hard rock or permanently waterlogged ground that preclude burrowing.
Because the aardvark depends on a specialized invertebrate diet rather than a particular vegetation type, its distribution is unusually wide for a large mammal. Genetic research nonetheless shows that populations are not uniform: analysis across the range found that climate and landscape features structure genetic differentiation, implying that regional populations may respond differently to future change [Epps et al. 2024].
In accordance with NRWL sensitive-species policy, specific site locations, corridor routes, and seasonal movement details are not disclosed in this article.
Conservation Status
The aardvark is currently listed as Least Concern on the IUCN Red List, reflecting its wide distribution, broad habitat tolerance, and presence in numerous protected areas across the continent [Taylor & Lehmann 2015]. The assessment notes, however, that the global population trend is unknown and that reliable continent-wide abundance data are lacking — a significant data gap for a nocturnal, fossorial species that is difficult to survey directly [Taylor & Lehmann 2015]. Regional assessments have flagged localized declines where agriculture and human settlement have removed suitable habitat.
The aardvark's conservation significance extends well beyond its own numbers. As a prolific burrow excavator, it functions as an ecosystem engineer: burrow entrances, spoil mounds, and abandoned tunnels create distinct microhabitats that differ measurably from surrounding ground in soil properties and plant communities [Haussmann et al. 2018]. Disused aardvark burrows are reused by a wide range of commensal species — including warthogs, porcupines, hyaenas, jackals, mongooses, reptiles, and numerous birds — many of which depend on these structures for shelter, thermal refuge, or nesting [Haussmann et al. 2018]. Researchers have warned that the loss of aardvarks could therefore destabilize the broader communities that rely on these diggings [Rey et al. 2017].
Threats
Climate change and drought have emerged as a documented, growing concern. A study of free-living aardvarks in the semi-arid Kalahari found that during an exceptionally hot, dry summer the animals could not meet their energy needs as ant and termite availability collapsed; most monitored individuals shifted from nocturnal to diurnal foraging, lost the ability to maintain stable body temperatures, and ultimately starved [Rey et al. 2017]. Follow-up physiological work confirmed that a shift toward daytime activity is itself a reliable signal of energy deficit in the species, linking climate-driven prey scarcity directly to survival [Weyer et al. 2020]. Because aardvarks depend on a narrow invertebrate prey base sensitive to temperature and rainfall, increasing drought frequency represents a distinctive vulnerability.
Habitat conversion reduces suitable range where grassland and savanna are cleared for cultivation, settlement, or intensive grazing, removing both prey habitat and diggable soils.
Bushmeat hunting affects aardvarks in parts of their range, where they are taken for meat and, in some regions, for body parts used in traditional practices. Their slow, predictable nocturnal movements and reliance on fixed burrows can make them susceptible to opportunistic hunting and snaring.
What Is Being Done
Protected-area coverage. The aardvark's broad distribution means it occurs within a large number of national parks and reserves across sub-Saharan Africa, where general habitat protection benefits the species indirectly [Taylor & Lehmann 2015].
Physiological and climate research. Long-term biologging studies in southern Africa have produced some of the clearest evidence yet of how a large mammal responds to climate-driven food scarcity, giving conservationists measurable early-warning indicators — such as the onset of daytime activity — for populations under thermal and nutritional stress [Rey et al. 2017; Weyer et al. 2020].
Population genetics and monitoring. Non-invasive genetic sampling, including DNA recovered from dung, lets researchers map population structure and environmental drivers of differentiation without disturbing the animals, building a baseline for tracking future range shifts [Epps et al. 2024].
Ecological-engineering studies. Research quantifying how aardvark burrows reshape soils, vegetation, and shelter availability has strengthened the case for treating the species as a keystone engineer whose protection benefits entire communities [Haussmann et al. 2018].
How Readers Can Help
Citizen science. Log wildlife observations — including burrow sightings and the species that use them — through platforms such as iNaturalist. Verified records contribute to range mapping and to the kind of distributional data the IUCN assessment identifies as lacking.
Support habitat conservation. Back organizations and policies that protect intact savanna and grassland ecosystems in sub-Saharan Africa, the habitats on which aardvarks and their prey depend.
Climate action. Because drought-driven prey scarcity is a documented threat to aardvarks, broad efforts to reduce greenhouse-gas emissions and to conserve resilient landscapes serve the species' long-term survival [Rey et al. 2017].
Education outreach. Share accurate, science-based information about the aardvark's role as an ecosystem engineer. Highlighting how many other animals depend on aardvark burrows helps build appreciation for an otherwise rarely seen species.
References
[Epps et al. 2024] Epps, C.W., Crowhurst, R.S., Spaan, R.S., Weldy, M.J. & Tavalire, H.F. (2024). Influence of climate and landscape on genetic differentiation of aardvarks (Orycteropus afer). Diversity and Distributions, 30(2), e13792. https://doi.org/10.1111/ddi.13792
[Haussmann et al. 2018] Haussmann, N.S., Louw, M.A., Lewis, S., Nicol, K.J., van der Merwe, S. & le Roux, P.C. (2018). Ecosystem engineering through aardvark (Orycteropus afer) burrowing: Mechanisms and effects. Ecological Engineering, 118, 66–72. https://doi.org/10.1016/j.ecoleng.2018.04.024
[Lehmann 2009] Lehmann, T. (2009). Phylogeny and systematics of the Orycteropodidae (Mammalia, Tubulidentata). Zoological Journal of the Linnean Society, 155(3), 649–702. https://doi.org/10.1111/j.1096-3642.2008.00460.x
[Rey et al. 2017] Rey, B., Fuller, A., Mitchell, D., Meyer, L.C.R. & Hetem, R.S. (2017). Drought-induced starvation of aardvarks in the Kalahari: an indirect effect of climate change. Biology Letters, 13(7), 20170301. https://doi.org/10.1098/rsbl.2017.0301
[Shoshani et al. 1988] Shoshani, J., Goldman, C.A. & Thewissen, J.G.M. (1988). Orycteropus afer. Mammalian Species, 300, 1–8. https://doi.org/10.2307/3503996
[Taylor & Lehmann 2015] Taylor, A. & Lehmann, T. (2015). Orycteropus afer. The IUCN Red List of Threatened Species 2015: e.T41504A21286437. https://dx.doi.org/10.2305/IUCN.UK.2015-2.RLTS.T41504A21286437.en
[Taylor & Skinner 2003] Taylor, W.A. & Skinner, J.D. (2003). Activity patterns, home ranges and burrow use of aardvarks (Orycteropus afer) in the Karoo. Journal of Zoology, 261(3), 291–297. https://doi.org/10.1017/S0952836903004217
[Taylor et al. 2002] Taylor, W.A., Lindsey, P.A. & Skinner, J.D. (2002). The feeding ecology of the aardvark Orycteropus afer. Journal of Arid Environments, 50(1), 135–152. https://doi.org/10.1006/jare.2001.0854
[Weyer et al. 2020] Weyer, N.M., Fuller, A., Haw, A.J., Meyer, L.C.R., Mitchell, D., Picker, M., Rey, B. & Hetem, R.S. (2020). Increased diurnal activity is indicative of energy deficit in a nocturnal mammal, the aardvark. Frontiers in Physiology, 11, 637. https://doi.org/10.3389/fphys.2020.00637