Guinea Pig

Guinea Pig facts at a glance

How big is a guinea pig?

An adult guinea pig measures 25 cm long — about 14% of the height of an average adult person (1.73 m) — and weighs around 1.0 kg, about 1% of an average adult’s body weight (70 kg).

What is a group of guinea pigs called?

Explore more animal collective nouns and baby animal names .

Social herd animals

Guinea pigs evolved as prey animals living in groups and should never be kept alone — a solitary guinea pig becomes lonely and stressed. Same-sex pairs or small groups work well, with careful introductions. They communicate through wheeking (food excitement), purring, chutting, and rumble-strutting during dominance displays.

Diet and scurvy risk

Like humans, guinea pigs cannot synthesise vitamin C and need daily fresh vegetables such as bell pepper and leafy greens alongside unlimited timothy hay and fortified pellets. Teeth grow continuously and are worn down by chewing hay and fibrous food. Without vitamin C they develop scurvy, which is fatal if untreated.

Andean domestication

Indigenous peoples of the Andes domesticated guinea pigs thousands of years ago for food and ritual use. Today they are beloved pets in Europe and the Americas, with dozens of coat varieties from smooth American to long-haired Peruvians.

Housing and handling

Guinea pigs need spacious, well-ventilated enclosures with hiding places, not wire floors that hurt feet. They startle easily but generally tolerate gentle handling once accustomed to people. Regular nail trims and weight checks help catch health problems early.

Did you know? Guinea Pig facts

• Guinea pigs are domesticated rodents from the Andes, kept worldwide as gentle pets that need company, unlimited hay, and vitamin C in their diet.
• No. Guinea pigs are social and should live with at least one compatible companion, preferably of the same sex or neutered mixed pairs.
• Typically 5–7 years, longer than hamsters or mice. Good diet, hay, and veterinary care support a longer life.
• Daily bell pepper, cucumber, lettuce, and herbs are popular. Avoid iceberg lettuce, potato, and rhubarb. Introduce new foods gradually.
• Guinea pigs are larger, diurnal, need vitamin C, and require companions. Hamsters are smaller, nocturnal, solitary, and have shorter lifespans.
• Conservation: Domesticated (IUCN).

Diet & feeding

Guinea Pig feeds primarily as a herbivore — hay, fresh vegetables, and guinea-pig pellets with vitamin c. Guinea pigs evolved as prey animals living in groups and should never be kept alone — a solitary guinea pig becomes lonely and stressed. Same-sex pairs or small groups work well, with careful introductions. They co

Adaptations

• Guinea pigs evolved as prey animals living in groups and should never be kept alone — a solitary guinea pig becomes lonely and stressed. Same-sex pairs or small groups work well, with careful introductions. They communicate through wheeking (food excitement), purring, chutting, and rumble-strutting during dominance displays.
• Like humans, guinea pigs cannot synthesise vitamin C and need daily fresh vegetables such as bell pepper and leafy greens alongside unlimited timothy hay and fortified pellets. Teeth grow continuously and are worn down by chewing hay and fibrous food. Without vitamin C they develop scurvy, which is fatal if untreated.

Behaviour & ecology

• Guinea pigs evolved as prey animals living in groups and should never be kept alone — a solitary guinea pig becomes lonely and stressed. Same-sex pairs or small groups work well, with careful introductions. They communicate through wheeking (food excitement), purring, chutting, and rumble-strutting during dominance displays.
• Like humans, guinea pigs cannot synthesise vitamin C and need daily fresh vegetables such as bell pepper and leafy greens alongside unlimited timothy hay and fortified pellets. Teeth grow continuously and are worn down by chewing hay and fibrous food. Without vitamin C they develop scurvy, which is fatal if untreated.
• Indigenous peoples of the Andes domesticated guinea pigs thousands of years ago for food and ritual use. Today they are beloved pets in Europe and the Americas, with dozens of coat varieties from smooth American to long-haired Peruvians.

Communication

• Guinea Pig uses scent, posture, and vocal signals to mark territory and coordinate social behaviour.
• Communication intensity often peaks during breeding seasons and territorial disputes.

Habitat & range

Domestic worldwide; wild cavies in South America

Ecological role

Guinea Pig shapes vegetation through grazing or browsing and serves as prey for larger predators where ranges overlap.

Conservation status of the Guinea Pig

Sources & references

This guide is compiled and reviewed against established zoological and conservation references. Key sources for the Guinea Pig:

• IUCN Red List of Threatened Species

  Conservation status (Domesticated) reflects the IUCN Red List category for Cavia porcellus.

• iNaturalist — observations & photos

  Search citizen-science observations and community IDs for Cavia porcellus. Useful for range checks and recent sightings — not a substitute for formal Red List status.

• GBIF — occurrence data

  Global Biodiversity Information Facility species search for Cavia porcellus. Explore published occurrence records used in range research.

• IUCN Red List — Cavia porcellus.

  Conservation status (Domesticated) and population trends.

• Animal Diversity Web — Cavia porcellus. University of Michigan Museum of Zoology.

  Life history, morphology, and range.

• Wikipedia — Guinea Pig.

  General taxonomy and overview (cross-check primary sources).

• Global Animal Guide editorial standards

  How we research, source, review, and update every guide for accuracy.