Short-tailed Chinchilla

The short-tailed chinchilla is a small, densely-furred rodent native to the high Andean mountains of northern Chile. It is renowned for having the softest and densest fur of any land mammal, which historically drove it to the brink of extinction through overhunting. Today it survives in a few isolated, fragmented populations in remote, rocky, arid highlands. It is a highly social, burrowing species adapted to extreme cold and high altitude.

Northern Chile, in the high Andes

Historically ranged across the Andes of Chile, Bolivia, Peru, and Argentina; today restricted almost entirely to a small number of isolated populations in northern Chile, primarily in the Antofagasta and Atacama regions, with a notable population in the Chinchilla National Reserve near Copiapó.

Altitude and depth

Approximately 2,000 to 5,000 meters above sea level

Seasonal movements

No true hibernation or migration, but activity and breeding are influenced by seasonal temperature extremes and food availability in the arid highland climate.

Arid and semi-arid rocky slopes, scree fields, and boulder outcrops in high-altitude Andean shrubland and steppe. Vegetation is sparse, dominated by low shrubs, grasses, and cacti. Animals shelter in rock crevices and burrows among boulders.

Adaptations to its environment

Extremely dense fur (up to 60 hairs per follicle) provides insulation against cold nights and thermal regulation at high altitude. Compact body, short ears and tail reduce heat loss, while strong hind legs allow agile movement across rocky terrain. Efficient kidneys and behavior help conserve water in the arid environment.

Endangered (EN) according to IUCN, due to a drastic population decline of over 90% historically from fur trade hunting, with continuing fragmentation and small population sizes limiting recovery.

Estimated population

Population size is poorly known but estimated to be only in the low thousands, fragmented into small, isolated subpopulations; overall trend considered declining or at best stable in protected areas.

Historical and ongoing illegal hunting for the fur trade, habitat degradation from mining and livestock grazing, small and fragmented population sizes leading to genetic isolation, and predation.

Diseases and parasites

Wild populations can be affected by external parasites such as mites and fleas, as well as gastrointestinal parasites; specific disease studies in wild populations are limited.

Protected under Chilean law and CITES Appendix I, with key subpopulations conserved within the Las Chinchillas National Reserve and other protected areas; captive breeding of domestic chinchillas (mostly derived from the related Chinchilla lanigera) has reduced pressure on wild populations for fur.

Recommended actions

Strengthen anti-poaching enforcement, expand and connect protected habitat corridors, conduct population monitoring and genetic studies, and promote community-based conservation and ecotourism initiatives in the region.

The short-tailed chinchilla has soft, thick, blue-grey to yellowish-grey fur, a rounded body, large rounded ears, and large dark eyes adapted for nocturnal vision. Its tail is notably shorter and thicker than that of its long-tailed relative.

Size

Body length approximately 25-38 cm, with a notably short tail of about 7-10 cm.

Weight

Adults typically weigh between 400 and 800 grams, with females generally slightly larger than males.

Distinctive features

Distinguished from the long-tailed chinchilla (Chinchilla lanigera) by its shorter tail, more compact and rounder body shape, shorter ears, and denser fur.

Differences between males and females

Sexual dimorphism is subtle; females tend to be slightly larger and heavier than males, which is unusual among mammals.

Highly social and gregarious, living in colonies that can range from a few dozen to several hundred individuals, often sharing communal burrows and rock crevices for shelter and protection from predators.

When it is active

Primarily crepuscular and nocturnal, being most active during dawn, dusk, and nighttime hours to avoid daytime heat and predators, while resting in burrows during the day.

Diet

Strict herbivore, feeding on grasses, herbs, shrubs, cacti, and other sparse vegetation found in its arid habitat; it obtains most of its water from food due to the dry environment.

Communication

Communicates through a range of vocalizations including chirps, barks, and squeaks, as well as body postures and scent marking to convey alarm, social status, or reproductive state within the colony.

Interactions with other species

Preyed upon by foxes, birds of prey, and other Andean carnivores; competes with other small herbivorous mammals for limited vegetation in its sparse habitat.

Role in its ecosystem

As a herbivore in a fragile high-altitude ecosystem, it plays a role in seed dispersal and vegetation dynamics, while also serving as a prey base for Andean predators.

Breeding typically occurs during the cooler months, with a long gestation period of about 105-115 days, and litters usually consisting of 1-3 pups. Young are born well-developed (precocial) with fur and open eyes.

Raising the young

Females are the primary caregivers, nursing and protecting the young within the safety of communal burrows; pups are weaned within 6-8 weeks but may remain within the social group for extended periods.

Maturity and lifespan

Sexual maturity is typically reached around 8 months of age; lifespan in the wild is estimated at 8-10 years, while captive individuals of related species can live 15-20 years or more.

Classification

Class Mammalia > Order Rodentia > Family Chinchillidae > Genus Chinchilla > Species Chinchilla chinchilla

Scientific synonyms

Chinchilla brevicaudata; Chinchilla boliviana

Recent studies

Recent conservation genetics studies have focused on assessing genetic diversity and population structure of remaining wild populations to guide reintroduction and management strategies.

Genome and DNA

Chinchilla species have a diploid chromosome number of 2n=64; genetic studies have focused mainly on domesticated chinchillas, with limited genomic research specifically on wild Chinchilla chinchilla.

Compared with similar species

Compared to the long-tailed chinchilla (Chinchilla lanigera), the short-tailed chinchilla is more robust, has a shorter tail and ears, and inhabits higher, more extreme Andean environments; it is also rarer and more endangered in the wild.

Its fur is so dense that up to 60 hairs can grow from a single follicle, making it nearly impossible for parasites like fleas to survive in its coat. Nearly all domesticated pet chinchillas today descend from the more common long-tailed species, not this rarer short-tailed relative.

Where and how to see it

Best observed at dawn or dusk in protected reserves such as Las Chinchillas National Reserve in Chile, using patience and quiet observation near rocky outcrops where colonies shelter.

Risks to humans

No notable risk to humans; it is a small, non-aggressive herbivorous rodent.

Human uses

Historically hunted extensively for its extremely soft fur, which nearly drove the species to extinction; today wild hunting is illegal, though fur farming continues using domesticated long-tailed chinchillas instead.

Myths and legends

In Andean folklore, chinchillas have sometimes been associated with mountain spirits due to their elusive nature and association with remote, rugged terrain, though specific legends are not well documented.