FaunaHub

Guinea Pig (Cavia porcellus)

MammalRodentDomesticated

Adult guinea pig (Cavia porcellus) on a wooden surface.

Domestic guinea pig (Cavia porcellus).

Image: Gzen92, CC BY-SA 4.0, via Wikimedia Commons.

Overview

The guinea pig (Cavia porcellus) is a domesticated rodent in the family Caviidae, native to South America. Despite the common name, guinea pigs are not pigs and are not from Guinea — they were domesticated in the Andean region thousands of years ago and have a long history alongside human communities. Today they are one of the most common small companion animals worldwide.

Habitat & Range

As a fully domestic species, the guinea pig is kept in homes globally. Wild cavies — closely related but distinct species — still live in South America in grasslands and rocky habitats. The domestic guinea pig is sensitive to temperature extremes and generally kept indoors at moderate room temperatures.

Diet

Guinea pigs are obligate herbivores requiring continuous access to grass hay, a measured ration of appropriate pellets, and fresh vitamin-C-rich greens. Critically, guinea pigs cannot produce vitamin C themselves and depend on dietary intake to avoid serious deficiency. A qualified exotic-animal vet should confirm the specifics of any guinea pig's diet, especially young, pregnant, lactating, or older animals.

Behavior

Guinea pigs are highly social and typically kept in same-sex or neutered pairs or small groups. They communicate using a distinctive range of vocalisations — including the well-known "wheeking" sound — and respond to consistent gentle handling. They are diurnal with quiet rest periods through the day and night.

Human Interaction & Conservation

Responsible ownership involves species-appropriate housing substantially larger than older pet-shop standards, daily fresh hay and greens, clean water, regular vet checks with a small-mammal-experienced veterinarian, and a long-term commitment — guinea pigs commonly live many years. Welfare regulations in some regions (notably Switzerland) require keeping guinea pigs in pairs. Verify local requirements before acquiring a guinea pig.

Similar Animals

Guinea pigs are most often compared in pet-decision contexts with rabbits — see rabbit-vs-guinea-pig — and with hamsters, although these are very different animals with different welfare needs.

Frequently Asked Questions — Guinea Pig

How long do guinea pigs live?
With appropriate husbandry, diet, and veterinary care, pet guinea pigs commonly live several years — longer than many first-time owners expect. Lifespan varies with husbandry and health. Discuss expectations with an exotic-animal veterinarian.
Do guinea pigs really need a companion?
Most welfare and veterinary sources recommend that guinea pigs live in same-sex or neutered pairs or small groups, given their highly social biology. Some jurisdictions require this in law. Solo housing requires substantially more human interaction and is not the default recommendation.
Why is vitamin C critical for guinea pigs?
Unlike most mammals, guinea pigs cannot synthesise vitamin C and depend on dietary intake. Insufficient vitamin C can cause serious health problems. Diet specifics should always be confirmed with an exotic-animal veterinarian familiar with guinea pigs.
Are guinea pigs good pets for children?
Guinea pigs are sometimes assumed to be 'easy' starter pets, but they have specific dietary, social, and housing requirements and need calm, careful handling. Successful child-and-guinea-pig households generally involve close adult supervision, structured care routines, and access to a small-mammal-experienced veterinarian.

Sources and further reading

Authoritative wildlife references used for general educational context. Conservation status should always be verified against current IUCN Red List data. External links open in a new tab.