Capybara

The capybara is the largest living rodent in the world, native to South America where it inhabits wetlands, rivers, and grasslands. It is a highly social, semi-aquatic mammal closely related to guinea pigs. Remarkable for its calm demeanor, it is often seen coexisting peacefully with many other species, earning it a reputation as one of the most sociable animals on Earth.

South America, primarily Venezuela, Colombia, Brazil, Argentina, Uruguay, Paraguay, and the Amazon and Pantanal basins

Widely distributed across South America east of the Andes, from Panama through Colombia, Venezuela, Guyana, Brazil, Bolivia, Paraguay, Uruguay, to northern Argentina. Absent from Chile and high Andean regions.

Altitude and depth

Generally found at low altitudes, from sea level up to about 1,300 meters

Seasonal movements

No true migration or hibernation; however, group sizes and movement patterns shift seasonally with water availability, congregating near remaining water sources during dry seasons

Found in densely vegetated areas near bodies of water such as rivers, lakes, ponds, marshes, and swamps. They favor savannas, tropical forests, and floodplains like the Pantanal and Llanos with permanent water access.

Adaptations to its environment

Webbed feet enable efficient swimming, while eyes, ears, and nostrils positioned high on the head allow the capybara to remain mostly submerged while alert. Their dense, coarse fur dries quickly, and they can hold their breath underwater for up to five minutes to evade predators.

Least Concern (LC) according to IUCN; populations are widespread, stable, and in some areas even increasing due to adaptability to human-altered landscapes

Estimated population

Population size is not precisely quantified but is considered large and stable across its range, with local increases noted in some human-modified habitats like ranches and urban wetlands

Hunting for meat and hide, habitat loss from agricultural expansion, and occasional culling due to conflicts with livestock or crops in some regions

Diseases and parasites

Susceptible to ticks (including those carrying Brazilian spotted fever), botfly larvae, and various endoparasites; they can also carry pathogens transmissible to livestock

Protected in some countries through hunting regulations; managed populations exist on ranches for sustainable meat and leather production, which incentivizes habitat preservation in places like Venezuela

Recommended actions

Continued monitoring of hunting pressure, maintenance of wetland habitats, and management of human-wildlife conflict in agricultural areas to sustain healthy populations

Capybaras have a barrel-shaped body covered in coarse, reddish-brown to grayish fur, with a large blunt head and small ears. Their short legs end in slightly webbed feet with four toes on the front and three on the back.

Size

Body length ranges from 100 to 134 cm, with a shoulder height of approximately 50-62 cm

Weight

Adults typically weigh between 35-66 kg, with some individuals reaching up to 91 kg; females are generally slightly heavier than males

Distinctive features

Distinguished from other rodents by their massive size, lack of a visible tail, and pig-like snout; the related lesser capybara (H. isthmius) is notably smaller

Differences between males and females

Minimal external dimorphism, though females tend to be slightly larger and heavier than males; males possess a prominent scent gland (morrillo) on the snout used for territorial marking

Highly social animals living in groups of 10-20 individuals, though groups can range from 2 to over 100 during dry seasons; groups have a dominant male, several females, offspring, and subordinate males

When it is active

Primarily crepuscular and diurnal, though they may become more nocturnal in areas with high human disturbance or hunting pressure

Diet

Strict herbivores feeding mainly on grasses and aquatic plants, consuming up to 3-3.6 kg of vegetation daily; they also practice coprophagy, re-ingesting their own feces to maximize nutrient absorption from tough plant fibers

Communication

Communicate through a variety of vocalizations including whistles, barks, purrs, and clicks, as well as scent marking via the morrillo gland and anal glands to establish territory and social bonds

Interactions with other species

Natural predators include jaguars, pumas, caimans, and anacondas; capybaras are famously tolerant of other species, often seen with birds like cattle egrets perched on their backs feeding on parasites

Role in its ecosystem

As grazers, capybaras help shape wetland and grassland vegetation structure and serve as an important prey base for large predators, playing a key role in the food web of South American wetland ecosystems

Breeding can occur year-round but often peaks with the onset of the rainy season; gestation lasts about 150 days, resulting in litters of 2-8 pups (average 4) that are precocial and mobile within hours of birth

Raising the young

Offspring are cared for communally within the group, with multiple females nursing pups regardless of parentage; young begin eating grass within a week but continue nursing for up to 16 weeks

Maturity and lifespan

Reach sexual maturity around 12-18 months of age; typical lifespan in the wild is 6-10 years, while captive individuals can live up to 12 years

Classification

Class Mammalia > Order Rodentia > Family Caviidae > Genus Hydrochoerus > Species Hydrochoerus hydrochaeris

Subspecies

Two recognized subspecies: H. h. hydrochaeris (most of South America) and H. h. isthmius (Panama and northwestern South America, sometimes considered a separate species, the lesser capybara)

Scientific synonyms

Sus hydrochaeris (Linnaeus, 1766), Hydrochoerus capybara

Recent studies

Recent research has focused on capybara adaptability to urban environments in Brazil and Argentina, as well as their role as reservoir hosts for zoonotic tick-borne pathogens

Genome and DNA

Diploid chromosome number of 2n=66; genomic studies have been used to clarify taxonomic relationships within Hydrochoerus and Caviidae family

Compared with similar species

Similar in ecological niche to the lesser capybara (Hydrochoerus isthmius) but notably larger; often compared to guinea pigs due to shared family Caviidae, though capybaras are vastly larger

Capybaras are known for their unusually calm and friendly temperament, often forming bonds with other animals like dogs, monkeys, and birds; they can sleep in water with just their nose exposed, and their name derives from the Guarani language meaning 'master of the grasses.'

Where and how to see it

Best observed at dawn or dusk near water bodies in the Pantanal (Brazil) or the Llanos (Venezuela), where they gather in visible groups; guided wildlife tours in these regions offer high viewing success year-round

Risks to humans

Generally low risk to humans; capybaras are docile but can carry ticks that transmit diseases like Brazilian spotted fever, and bites may occur if provoked or cornered

Human uses

Farmed in parts of South America for meat and leather (particularly in Venezuela), and increasingly kept as exotic pets in some countries; also popular attractions in zoos and wildlife parks worldwide

Myths and legends

In some South American folklore, capybaras are seen as symbols of peace and sociability; the Catholic Church in the 16th century controversially classified capybara meat as fish, allowing its consumption during Lent