Mammals comparison

Rabbit vs Capybara: Key Differences Explained

The short answer

The capybara is the largest living rodent, semi-aquatic, and lives in large social groups in South American wetlands, weighing tens of kilograms. The rabbit is a much smaller lagomorph — a different order entirely — that digs burrows and lives in grassland and scrub. Both are highly social hindgut fermenters that practise caecotrophy, which is where the genuine similarity lies.

The main difference

A capybara is the largest rodent, semi-aquatic and living in large groups; a rabbit is a much smaller burrowing lagomorph from a different order.

Capybaras are frequently described as giant guinea pigs or oversized rabbits, and setting them against a rabbit clarifies both what they actually are and what the two genuinely share.

At a glance

Comparison of Rabbit and Capybara across 6 dimensions, with an interpretation of each difference.
What differs	Rabbit	Capybara	What it means
Taxonomic order	Lagomorpha, with a second pair of peg teeth behind the upper incisors	Rodentia, in the South American caviomorph group with guinea pigs	Different orders, so the resemblance in ecology is convergent rather than inherited.
Adult size	Roughly 1–2.5 kg in wild European rabbits	Commonly 35–65 kg — the largest living rodent	The size gap is one of the largest in any comparison between herbivores of similar diet.
Relationship with water	Avoids water; escapes underground	Semi-aquatic — swims well and submerges to escape predators	Eyes, ears and nostrils set high on the capybara's head allow it to stay submerged while alert.
Shelter	Excavates burrows and warrens	Does not burrow; rests in vegetation near water	Escape strategy differs completely — underground against underwater.
Digestion	Hindgut fermenter practising caecotrophy	Hindgut fermenter also practising caecotrophy	This is the genuine shared trait, arrived at independently in both lineages.
Social structure	Group-living in warrens, with established structure	Large groups, sometimes numbering dozens around water	Both are social herbivores, though capybara groups can be far larger.

Taxonomic order: RabbitLagomorpha, with a second pair of peg teeth behind the upper incisors
CapybaraRodentia, in the South American caviomorph group with guinea pigs
Different orders, so the resemblance in ecology is convergent rather than inherited.
Adult size: RabbitRoughly 1–2.5 kg in wild European rabbits
CapybaraCommonly 35–65 kg — the largest living rodent
The size gap is one of the largest in any comparison between herbivores of similar diet.
Relationship with water: RabbitAvoids water; escapes underground
CapybaraSemi-aquatic — swims well and submerges to escape predators
Eyes, ears and nostrils set high on the capybara's head allow it to stay submerged while alert.
Shelter: RabbitExcavates burrows and warrens
CapybaraDoes not burrow; rests in vegetation near water
Escape strategy differs completely — underground against underwater.
Digestion: RabbitHindgut fermenter practising caecotrophy
CapybaraHindgut fermenter also practising caecotrophy
This is the genuine shared trait, arrived at independently in both lineages.
Social structure: RabbitGroup-living in warrens, with established structure
CapybaraLarge groups, sometimes numbering dozens around water
Both are social herbivores, though capybara groups can be far larger.

How they are related

The capybara is a caviomorph rodent, closely related to guinea pigs and rock cavies. The rabbit is a lagomorph, a separate order. So the capybara really is a giant relative of the guinea pig, but it is not a giant rabbit. Their similar diet and digestion are convergent solutions to processing large amounts of low-quality plant material.

Telling them apart

There is no scope for confusion given the size difference: an adult capybara can weigh thirty times a wild rabbit. The capybara's blunt squared muzzle, high-set eyes and ears, and near-absent tail are distinctive, as is its habit of resting at the water's edge in groups.

Very large, blunt-faced, semi-aquatic, in a group by water in South America: capybara, a rodent. Small, long-eared, burrowing, in grassland or scrub: rabbit, a lagomorph. Their shared digestion is real convergence; their supposed kinship is not.

Habitat and distribution

Capybaras occupy wetlands, riverbanks, marshes and flooded grassland across much of South America, and are never far from water. Rabbits occupy grassland, dune, scrub and woodland edge with soil suitable for digging, and the European rabbit has been introduced widely beyond its native range with severe ecological consequences in places.

Diet and ecological role

Both are herbivores that graze grasses and aquatic or terrestrial vegetation, and both are hindgut fermenters practising caecotrophy — reingesting a soft dropping type to pass nutrients through the gut twice. Both also have continuously growing teeth worn down by abrasive plant material. This dietary and digestive convergence is genuine and notable.

Behaviour

Capybaras are highly social, resting in groups at the water's edge and entering water to escape predators, where they can submerge with only eyes, ears and nostrils exposed. Rabbits are social within warrens and escape underground, thumping a hind foot in alarm. Both are prey animals whose behaviour is organised around detecting and evading predators.

People and these animals

Capybaras are hunted for meat and hide in parts of their range and are farmed in some regions, and they have become established outside their native range in places. They are also kept as exotic pets in some jurisdictions, which raises substantial welfare and legality questions. Rabbits are domesticated worldwide and are simultaneously one of the most damaging introduced species in several countries.

Keeping them: what to understand first

Capybaras are wild animals with semi-aquatic, highly social requirements that domestic settings very rarely meet, and keeping them is restricted or prohibited in many jurisdictions. Domestic rabbits are genuinely domesticated but have welfare needs that are commonly underestimated. Nothing here is care guidance, and exotic-animal keeping decisions should involve local law and a veterinarian experienced with the species.

What they have in common

Both are social herbivores that graze grasses and other vegetation.
Both are hindgut fermenters that practise caecotrophy to extract nutrients twice.
Both have continuously growing teeth worn down by abrasive plant material.
Both are prey animals whose behaviour is organised around predator avoidance.

Key differences

Capybaras are rodents; rabbits are lagomorphs from a separate order.
Capybaras are the largest living rodents, many times a rabbit's mass.
Capybaras are semi-aquatic and escape into water; rabbits escape into burrows.
Capybaras do not dig burrows, while rabbits build extensive warrens.
Rabbits are fully domesticated, whereas capybaras are not.

Where people go wrong

Describing capybaras as giant rabbits, when they are rodents related to guinea pigs.
Assuming shared digestion implies close kinship.
Treating capybaras as domesticated because they appear tame in photographs.

Frequently asked questions

Is a capybara a giant rabbit?

No. Capybaras are rodents in the South American caviomorph group, closely related to guinea pigs and rock cavies. Rabbits are lagomorphs, a separate order distinguished by an extra pair of small peg teeth behind the upper incisors. Calling a capybara a giant guinea pig is much closer to accurate; calling it a giant rabbit is not.

What do the two genuinely have in common?

Their digestion. Both are hindgut fermenters that practise caecotrophy, reingesting a specific soft dropping type so nutrients pass through the gut twice — an efficient way to extract value from fibrous, low-quality plant food. Both also have continuously growing teeth worn down by abrasive vegetation. These are convergent solutions to the same dietary problem rather than inherited traits.

Why are capybaras semi-aquatic?

Water is their escape route and their habitat. They have partially webbed feet, swim strongly, and can submerge with only eyes, ears and nostrils above the surface because those features sit high on the head. Predators including jaguars and caimans make rapid access to water valuable, and the wetland vegetation they graze grows there. Rabbits solved the same predation problem by digging instead.

Do capybaras make good pets?

They are wild animals with requirements that domestic settings very rarely meet — they are large, highly social, need constant access to water deep enough to swim in, and graze continuously. Keeping them is restricted or prohibited in many jurisdictions. This page does not advise on exotic-animal keeping; local law and a veterinarian experienced with the species are the appropriate sources.

Read the full profiles

Sources and methodology

How this comparison is built: FaunaHub comparisons are assembled from the sourced animal profiles behind them rather than written as standalone claims. Figures such as size, mass, and lifespan are typical ranges that vary by subspecies, population, region, sex, age, and — where relevant — whether an animal lives in the wild or under human care, so they are presented as ranges rather than fixed values. Where a common name covers a group rather than a single species, the page says so instead of implying a species-to-species match. Conservation status changes over time and should be confirmed against the current IUCN Red List. Dimensions that could not be supported from the underlying profiles are omitted rather than filled in.

What this page does not do: it does not rank the two animals, predict the outcome of a confrontation, or present either one as stronger, smarter, or better. It is not veterinary, medical, first-aid, handling, capture, hunting, or pest-control guidance. For an animal in your care, or any situation involving injury, contact a qualified veterinarian, your local wildlife authority, or emergency services.

Sources and further reading

Authoritative references used for general educational context. External links open in a new tab. These sources do not endorse FaunaHub.

UniversityAnimal Diversity Web — Oryctolagus cuniculus (European rabbit) — University of Michigan species account
ReferenceBritannica — Rabbit (family Leporidae) — Editor-reviewed encyclopedia entry
Wildlife referenceHouse Rabbit Society — Care — Educational guidance on rabbit welfare and care
UniversityAnimal Diversity Web — Hydrochoerus hydrochaeris (capybara) — University of Michigan species account
ReferenceBritannica — Capybara — Editor-reviewed encyclopedia entry
Wildlife referenceIUCN Red List of Threatened Species — Authoritative source for current conservation status
UniversityAnimal Diversity Web — University of Michigan Museum of Zoology — Peer-edited reference accounts for animal species
ReferenceEncyclopaedia Britannica — Animals reference — Editor-reviewed encyclopedia overview entries

Last updated: 2026-08-04