“Capybaras have barrel-shaped bodies, short legs, and almost no tail. Their eyes, ears, and nostrils sit high on the head so they can breathe and watch while mostly underwater. They have partially webbed feet, 20 ever-growing teeth, coarse sparse fur, and a large gut chamber for digesting grass. Males have a prominent scent gland on the snout.”
The capybara’s body is a masterpiece of adaptation to life as a semi-aquatic grazer. Every feature, from the placement of its eyes to the shape of its feet, helps it survive in the wetlands of South America. Here’s a head-to-toe tour of capybara anatomy.
Capybara Body at a Glance
| Feature | Details |
|---|---|
| Weight | About 77 to 146 pounds |
| Length | About 3.5 to 4.4 feet |
| Shoulder height | About 20 to 24 inches |
| Teeth | 20, all continuously growing |
| Toes | 4 on front feet, 3 on hind feet, partially webbed |
| Tail | Vestigial, barely visible |
| Fur | Coarse, sparse, reddish-brown to grayish |
| Scent glands | Morrillo on snout; anal glands |
See our capybara size guide for more measurements.
Head
Eyes, Ears, and Nostrils
A capybara’s eyes, ears, and nostrils are positioned high on the head, almost in a straight line. This lets it float with most of its body underwater while still seeing, hearing, and breathing, a design shared with hippos and crocodiles. Its small ears can fold to keep out water. See capybara vs hippo.
The Morrillo
On top of the snout sits a dark, hairless, oval bump called the morrillo, a scent gland. It’s large and prominent in adult males and much smaller in females. Males rub it on grass and shrubs to leave scent marks that signal dominance and territory. See capybara communication.
Teeth
Capybaras have 20 teeth: four large incisors at the front and 16 cheek teeth for grinding. All of them grow continuously throughout life. The incisors are wide, chisel-shaped, and orange-tinted, while the cheek teeth have complex ridges for grinding tough grasses. Constant chewing wears them down. See capybara teeth.
Body
Capybaras have a heavy, barrel-shaped body built for processing large amounts of vegetation. The rear is slightly higher than the front, giving them a distinctive posture. Despite their bulky look, they can run up to about 22 mph in short bursts.
Fur and Skin
Capybara fur is long, coarse, and sparse, with visible skin between hairs. Coat color ranges from reddish-brown to grayish or yellowish-brown, often lighter underneath. This thin coat dries quickly after swimming but offers little protection from sun or cold. That’s why capybaras rely on water and mud to protect their skin and on shade to avoid overheating. Rare color variants, including very pale individuals, also occur. See albino capybaras and capybaras in winter.
Legs and Feet
Capybaras have short, sturdy legs. Their front feet have four toes and their hind feet have three, each with strong, hoof-like nails. Partial webbing between the toes makes them powerful swimmers. The front legs are slightly shorter than the hind legs. See capybara swimming.
Tail
Capybaras have only a tiny, vestigial tail that’s barely visible. Their cousins, guinea pigs, are also essentially tailless. See capybara vs guinea pig.
Digestive System
Capybaras are hindgut fermenters. After food passes through the stomach and small intestine, it reaches a large chamber called the cecum, where microbes break down tough plant fiber. Because many nutrients are released after the small intestine, capybaras practice coprophagy, eating special soft droppings, often in the morning, to absorb the vitamins and nutrients produced by fermentation. They also rely on dietary vitamin C, like guinea pigs. See what capybaras eat and capybara health problems.
Senses
- Smell: key for recognizing group members and reading scent marks.
- Hearing: important for picking up alarm calls from the group.
- Vision: side-facing eyes give a wide field of view to spot predators.
- Touch: whiskers help them navigate and feel their surroundings.
Male vs Female Capybaras
| Feature | Males | Females |
|---|---|---|
| Morrillo | Large and prominent | Small |
| Size | Slightly smaller on average | Slightly larger on average |
| Behavior | Heavy scent marking; dominant males guard females | Form the stable core of the group |
Females being slightly larger than males is unusual among mammals. See capybara social structure.
Baby Capybara Anatomy
Capybara pups are born remarkably developed: furred, with open eyes and functional teeth. They can walk and follow their mother within hours and nibble grass within days. See baby capybaras.
How Capybara Anatomy Compares with Other Rodents
Like all rodents, capybaras have ever-growing incisors and no canine teeth. Their large size, partially webbed feet, and high-set facial features set them apart from most relatives. Learn about general rodent bodies in rodent anatomy.
Built for Swimming
Many of the capybara’s features work together in water. The high-set eyes, ears, and nostrils let it lie almost fully submerged while keeping watch. Partially webbed feet provide thrust, and the heavy body sits low in the water, making it less visible to predators. When danger appears, a capybara can dive and stay underwater for up to about five minutes, closing its nostrils and ears. It can even doze in shallow water with just its nose above the surface. These adaptations explain why water is the capybara’s main escape route from jaguars and other land predators. See capybara predators.
Keeping Cool
Capybaras have limited ways to shed heat. Their sparse coat helps, but on hot days they depend on water, mud, and shade. Soaking lowers body temperature and protects the skin from sunburn and drying. This is why access to water is essential for captive capybaras and why they’re most active in the cooler hours of morning and evening. See capybara enclosure and pool setup.
Anatomy and Health
Knowing capybara anatomy helps explain common health problems. Ever-growing teeth can overgrow without enough grazing. Sparse fur leaves skin vulnerable to sunburn, dryness, and infections. The need for dietary vitamin C means deficiencies can develop on a poor diet. And a digestive system built for grass reacts badly to sudden changes or sugary foods. Good care is really about supporting the body capybaras evolved.
Frequently Asked Questions
How many toes do capybaras have?
Four on each front foot and three on each hind foot.
Do capybaras have tails?
Only a tiny, vestigial tail that’s barely visible.
What is the bump on a capybara’s nose?
It’s a scent gland called the morrillo, most prominent in males.
Why are capybara eyes on top of their heads?
So they can see, hear, and breathe while mostly submerged in water.