Large Hairy Armadillo

The Large Hairy Armadillo is a medium-sized armadillo native to the temperate and arid regions of southern South America, particularly the Pampas and Patagonian steppe of Argentina. It is notable for its dense covering of coarse hair between its bony scutes, giving it a distinctly shaggy appearance compared to other armadillo species. This adaptable and opportunistic omnivore is one of the most widespread and commonly encountered armadillos in its range, often seen foraging in agricultural areas.

Southern South America, primarily Argentina, with range extending into Bolivia, Paraguay, Uruguay, and Chile

Found throughout central and southern Argentina including the Pampas and Patagonia, extending into southern Bolivia, western Paraguay, Uruguay, and parts of Chile. It has one of the broadest ranges among South American armadillo species.

Altitude and depth

Typically found from sea level up to about 1,500 meters elevation

Seasonal movements

No true hibernation, but activity patterns shift seasonally; individuals become more diurnal in cold winter months and more nocturnal during hot summers to avoid temperature extremes

Inhabits grasslands, pampas, scrublands, and semi-arid steppe habitats. Also found in agricultural fields, pastures, and areas with sandy or loose soils suitable for digging burrows. Tolerates a wide range of open and semi-open habitats.

Adaptations to its environment

Possesses powerful claws and forelimbs adapted for rapid digging of burrows used for shelter and thermoregulation. Its bony dermal armor (carapace) provides protection from predators, while dense body hair helps insulate against temperature extremes in open habitats. Can also curl partially to protect vulnerable areas when threatened.

Listed as Least Concern (LC) by the IUCN due to its wide distribution, adaptability to human-modified landscapes, and presumed large population size, though some regional declines have been noted due to hunting and habitat conversion.

Estimated population

No precise global population estimate exists, but the species is considered abundant and stable across most of its range; local declines occur near urban and heavily hunted areas

Hunted for meat by local communities in parts of its range; considered an agricultural pest in some areas leading to persecution; habitat conversion for farming; occasional roadkill mortality; predation by domestic dogs.

Diseases and parasites

Known to harbor ticks, mites, and intestinal parasites; can be a reservoir for Trypanosoma cruzi (Chagas disease agent) in some regions, similar to other armadillo species.

Protected in some Argentine national parks and reserves; included in general wildlife protection legislation in Argentina; no species-specific conservation programs currently exist due to its non-threatened status

Recommended actions

Monitor population trends in areas of high hunting pressure; regulate hunting for bushmeat where unsustainable; promote coexistence strategies with agricultural communities; further research into population dynamics across its range.

Covered in a bony carapace divided into movable bands, overlaid with long, coarse, yellowish-brown to dark brown hair protruding between the scutes. The head is small and elongated with a pointed snout, and the ears are relatively large and rounded. Legs are short and powerful, ending in strong claws.

Size

Body length (head and body) ranges from 30 to 50 cm, with an additional tail length of about 12-16 cm

Weight

Adults typically weigh between 2 and 6.5 kg, with males generally slightly larger than females

Distinctive features

Distinguished from related species by its notably dense and long body hair (hence 'hairy' armadillo), larger overall size compared to the Screaming Hairy Armadillo, and a broader, more robust build with 6-8 movable bands on its carapace.

Differences between males and females

Minimal sexual dimorphism; males are on average slightly heavier and larger than females, but external differences are not pronounced

Primarily solitary animals, coming together only briefly for mating; individuals maintain and defend burrow systems and forage independently.

When it is active

Primarily nocturnal and crepuscular, though can be active during the day in cooler seasons or in undisturbed areas

Diet

Omnivorous generalist feeding on insects, larvae, earthworms, small vertebrates (including carrion), eggs, and plant material such as roots, fruits, and seeds. Highly opportunistic and adapts diet to local food availability.

How it feeds and hunts

Uses strong sense of smell to locate buried invertebrates and small prey, digging rapidly with forelimbs to excavate food from soil; will also scavenge carrion and raid bird nests when available.

Communication

Communicates primarily through scent marking of territory and burrows using scent glands; limited vocalizations include grunts and hissing sounds, especially when threatened or during aggressive encounters.

Interactions with other species

Preyed upon by large birds of prey, foxes, and domestic dogs, especially as juveniles; competes with other burrowing animals for den sites; burrows are sometimes used by other species after abandonment.

Role in its ecosystem

Plays an important ecological role as a soil aerator through its digging activity and as a natural pest controller by consuming large quantities of insects and larvae; its burrows also provide shelter for various other small animals.

Breeding can occur year-round but peaks in spring and summer; gestation lasts approximately 60-75 days; typically gives birth to 1-2 (occasionally up to 4) young per litter.

Raising the young

Females provide all parental care, nursing and protecting young in the burrow for several weeks until they are weaned and able to forage independently; juveniles reach independence within a few months.

Maturity and lifespan

Reaches sexual maturity around 9 months to 1 year of age; lifespan in the wild is approximately 8-10 years, while captive individuals have been recorded living up to 15-18 years.

Classification

Class Mammalia > Order Cingulata > Family Chlamyphoridae > Genus Chaetophractus > Species Chaetophractus villosus

Scientific synonyms

Dasypus villosus (original combination); Euphractus villosus

Recent studies

Recent studies have focused on its role as a Trypanosoma cruzi reservoir relevant to Chagas disease epidemiology, as well as investigations into its burrowing ecology and impacts on soil health in agricultural landscapes.

Genome and DNA

Diploid chromosome number reported as 2n=60-62 in some cytogenetic studies of the genus, though detailed genomic studies remain limited compared to other mammals.

Compared with similar species

Similar to the Screaming Hairy Armadillo (Chaetophractus vellerosus) but larger in size with denser hair; distinguished from the Six-banded Armadillo (Euphractus sexcinctus) by its longer fur and different band count and body proportions.

Despite its armored appearance, this armadillo can dig a burrow to escape a predator in under two minutes; it is capable swimmer and can hold its breath for several minutes while crossing water bodies; some individuals have been observed to partially inflate their intestines to help them float.

Where and how to see it

Best observed at dusk or dawn in open pampas or scrubland areas of central Argentina, particularly around burrow entrances; using a red-filtered flashlight at night in rural or protected areas increases chances of sighting without disturbing the animal.

Risks to humans

No notable risk to humans in terms of aggression, though it can carry parasites and pathogens (such as Trypanosoma cruzi) that pose indirect health risks if handled improperly.

Human uses

Hunted locally for its meat, which is considered a traditional food source in parts of rural Argentina; its shell has occasionally been used to make traditional handicrafts or musical instruments in some communities.

Myths and legends

In some rural South American folklore, armadillos are associated with the underworld and earth due to their burrowing habits, though no widespread specific legends are attributed uniquely to this species.