Capybaras

Quick Facts

• Scientific Name: Hydrochoerus hydrochaeris
• Spanish Name: Chigüiro
• Family: Caviidae
• Known Nicknames: Carpincho, Water Hog, Greater Capybara
• Average Length: 106–134 cm / 42–53 in
• Average Weight: 35–66 kg / 77–146 lb
• Wingspan: N/A
• Key Feature: Barrel-shaped body with a blunt snout and partially webbed feet
• Primary Diet: Herbivore (Grasses, aquatic plants, fruit, and tree bark)
• Range: South America (East of the Andes from Colombia to Northern Argentina)
• Habitat: Dense vegetation surrounding bodies of water such as rivers, lakes, and marshes
• Social Structure: Highly Social (Groups of 10–30 individuals)
• Nesting/Breeding: On land, typically within dense vegetation for cover
• Statut de conservation : Préoccupation mineure (LC)
• Population Trend: Stable

The capybara (*Hydrochoerus hydrochaeris*) is the world's largest living rodent, a title it carries with a remarkably calm and social disposition that has earned it the nickname "nature’s ottoman." Native to the wetlands and dense forests of South America, these semi-aquatic mammals are easily recognized by their heavy, barrel-shaped bodies covered in coarse, reddish-brown fur and their distinctive blunt snouts. To thrive in their watery habitats, they possess specialized webbed feet for swimming and have their eyes, ears, and nostrils positioned high on their heads—much like a hippopotamus—allowing them to stay mostly submerged while remaining alert to predators. Capybaras are highly gregarious creatures that live in large family groups, and their unique ability to hold their breath for up to five minutes underwater makes them as agile in the river as they are relaxed on the shore.

Faits amusants

Known as "nature's ottomans," these social rodents frequently allow other animals, including birds and monkeys, to lounge on their backs due to their incredibly chill disposition. They are expertly adapted for life in the water with webbed feet and facial features positioned high on their heads, allowing them to breathe and see while remaining mostly submerged. To maximize nutrition from their fibrous diet, they engage in autocoprophagy, which involves eating their own protein-rich morning droppings to re-digest beneficial bacteria. Additionally, a capybara's teeth grow continuously throughout its life, requiring constant grinding on aquatic plants and grasses to keep them filed down to a manageable length.

Habitats et répartition

These semiaquatic rodents are strictly tied to water sources, inhabiting areas such as marshes, swamps, lakes, and rivers. They require a combination of aquatic environments for safety and thermoregulation, alongside adjacent dry land like savannas and tropical forests for grazing and resting. Their presence is most common in seasonally flooded grasslands and lowland forests where water is accessible year-round. Geographically, they are native to South America, with a range that extends from Panama in Central America through the majority of the continent east of the Andes. They are found across the Amazon Basin and as far south as northern Argentina and Uruguay. While they are widespread throughout most South American countries, they are notably absent from the high-altitude regions of the Andes and the arid climates of Chile.

Comportements & Reproduction

Highly gregarious and semi-aquatic, these rodents live in stable social groups typically ranging from 10 to 30 individuals, organized around a dominant male. This leader maintains his status through scent marking with a specialized snout gland called a morillo and by defending his position against subordinate males who live on the group's periphery. Group members rely on a complex system of vocalizations, including barks and whistles, to maintain social bonds and alert others to predators, while frequently retreating to the water for safety and thermoregulation. Mating occurs year-round with a peak during the rainy season and takes place exclusively in the water. Although the dominant male attempts to monopolize females, subordinate males often successfully mate as well. After a gestation period of roughly 150 days, females produce litters of precocial young that are capable of grazing shortly after birth. A notable reproductive strategy is alloparenting, in which females within the group communally nurse and protect one another's offspring, a behavior that enhances the survival of the young within the herd.

Alimentation

Capybaras are strictly herbivorous mammals that primarily consume a variety of grasses and aquatic plants, supplemented occasionally by reeds, grains, melons, and tree bark. These semi-aquatic rodents are highly selective feeders, often focusing on specific plant species while ignoring others, and can consume between six to eight pounds of vegetation daily. A particularly fascinating aspect of their digestive process is autocoprophagy, a behavior where capybaras ingest their own soft morning feces to extract maximum nutritional value, specifically protein and vitamins, and to maintain the healthy bacterial flora necessary for breaking down tough cellulose. To accommodate this constant grazing, their teeth grow continuously throughout their lives to compensate for the significant wear and tear caused by the abrasive silica found in their preferred grasses.

Couleurs

Capybaras feature coarse, sparse fur in solid shades of reddish-brown to grayish-brown, often fading to a lighter yellowish-brown on the belly. They lack distinct markings or patterns, relying on their drab, earthy coloration to provide natural camouflage against the muddy riverbanks and murky waters of their native South American wetlands.

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