Caviacavies and Guinea pigs


Guinea pigs, or cavies, (genus Cavia) are in the subfamily Caviinae, which also includes mountain cavies (Microcavia) and yellow-toothed cavies (Galea). There are six widely recognized species of guinea pigs, one of which has been domesticated. The extant species include Brazilian guinea pigs (Cavia aperea), shiny guinea pigs (Cavia fulgida), Moleques do sul guinea pigs (Cavia intermedia), greater guinea pigs (Cavia magna), montane guinea pigs (Cavia tschudii), and domestic guinea pigs (Cavia porcellus). There is also fossil evidence of four extinct Cavia species. Guinea pig species vary in coloration, but they all have have short, stocky bodies with short legs. In some species, males are larger than females on average. (Cherem and Ferigolo, 2021; Dunnum and Salazar-Bravo, 2010)

Geographic Range

Wild guinea pigs are endemic to South America. However, domestic guinea pigs (Cavia porcellus) are found worldwide as popular household pets or as laboratory research animals. (Adrian, et al., 2005)


Guinea pigs typically live in areas with tall, dense vegetation that can conceal them from predators, although they also forage in open areas. Wild guinea pigs typically inhabit grasslands and scrublands at a wide range of elevations. They live in herds that occupy a shared home range, which varies in size depending on resource availability (e.g., food, shelter). In some cases, males have larger home ranges than females. (Asher, et al., 2004)

Systematic and Taxonomic History

Guinea pigs are rodents (order Rodentia) in the family Caviidae, which includes guinea pigs and cavies (subfamily Caviinae), maras (subfamily Dolichotinae), and capybaras (subfamily Hydrochoerinae). There is debate regarding the number of species that truly belong in the genus Cavia genus, but there is consensus on five wild species and one domestic species. The genus was first described in 1766 with one species, Cavia pallas, which is no longer considered a valid taxonomic species. (Cherem, et al., 1999; Dunnum and Salazar-Bravo, 2010)

  • Synonyms
    • Cavia anolaimae
    • Cavia aperea guianae
    • Cavia aperea patzelti

Physical Description

Guinea pigs have oblong, stocky bodies with no tails, short legs, and short, wide ears. They have four fingers on their forefeet and three fingers on their hindfeet, with short, sharp nails on all of their digits. Guinea pigs have variable hair length and coloration. They can be tan, brown, white, or black and can either be one solid color or have splotchy, multicolored pelage. There is a breed of domestic guinea pig (Cavia porcellus), called skinny pigs, that are nearly hairless, with tufts of hair on their muzzles and feet.

Guinea pigs are large compared to most other rodents, with adults ranging from 20 to 25 cm in length and 700 to 1,200 g in weight. Male and females look virtually identical, although males are slightly larger on average. Because male and female guinea pigs are similar in size and lack conspicuous external genitalia, it can be difficult to determine their sex, especially when they are juveniles. Guinea pigs have two prominent incisors, which grow continuously and they can be a medical concern if they grow too long. (Riggs, 2009)

  • Sexual Dimorphism
  • sexes alike
  • male larger


Wild guinea pigs exhibit polygynous mating behavior, but they may also be monogamous within breeding seasons. Sexually mature males exhibit "nuzzling" behavior, which is characterized by sniffing and licking of sexually mature females. Males will follow females they are interested them while circling them and nuzzling them. Males may also emit low "purring" vocalizations, and eventually mount females if they are receptive to mating. Males will mark previous mates using chemicals from their anal glands, but they rarely defend females from intruding males directly. (Asher, et al., 2004; Cohn, et al., 2004; Riggs, 2009; Young, 1969)

Female guinea pigs reach sexual maturity in as little as 6 weeks, and males can reach sexual maturity by the time they are 10 weeks old. Pregnant females gestate young for an average of 68 days, which is longer than most rodents (order Rodentia). Litter sizes can range from 1 to 6 pups. Pregnancy and parturition becomes significantly harder for females older than 6 months of age due to mineralization of their pubic symphyses. (Riggs, 2009)

There is limited information regarding parental investment in guinea pigs. Newborn guinea pigs are precocial and can begin to eat solid food immediately after birth. However, females will nurse their young for as long as 32 days after birth, but otherwise show minimal interest in young. In natural populations, unweaned juveniles have been observed grazing with parents. Some research on paternal behavior indicates that males also care for their young, performing activities such as grooming and playing. (Adrian, et al., 2005; Rehling and Trillmich, 2007; Riggs, 2009)

  • Parental Investment
  • precocial
  • male parental care
  • female parental care
  • pre-hatching/birth
    • provisioning
      • female
    • protecting
      • female
  • pre-weaning/fledging
    • provisioning
      • female
    • protecting
      • male
      • female
  • pre-independence
    • protecting
      • male
      • female
  • post-independence association with parents


The average lifespan of guinea pigs is between 5 and 7 years, but there are reports of guinea pigs living up to 12 years in captivity. ("AnAge: The Animal Ageing and Longevity Database", 2017; O'Rourke, 2004)


Guinea pigs are highly social animals. They typically live in herds consisting of an alpha male and several females. They live in areas that protect them from predation, such as rock crevices, areas with dense vegetation, or burrows built by other animals. Guinea pigs are active for nearly 20 hours per day, resting intermittently throughout the day. However, much of their foraging activity is crepuscular. Herd social behaviors include grooming, sitting with body contact, and playing. They also use social vocalizations that range from low and quiet to shrill and loud. Guinea pigs may also chatter their teeth as a sign of aggression towards other guinea pigs or other animals. (Asher, et al., 2004; Bradley, 2001; Wagner and Manning, 1976)

Communication and Perception

Guinea pigs are born with their eyes open, but do not have well-developed object discrimination or depth perception. Research suggests that guinea pigs rely somewhat on visual cues, but are more heavily reliant on acoustic and olfactory cues to detect predators and communicate with conspecifics. Overall, more research is needed to determine the extent to which guinea pigs use various senses to perceive their environment. However, research has clearly demonstrated that olfactory signals play a large role in intraspecific communication, both within social herds and with unfamiliar conspecifics. Guinea pigs mostly use their anal glands for scent marking, but urine may also play a role in chemical communication. Guinea pigs likely also communicate using tactile stimuli. For instance, sexually active males will nuzzle females as part of the courtship process, and individuals frequently maintain physical contact with other members of their herd. (Wagner and Manning, 1976)

Food Habits

Guinea pigs are herbivores, mostly eating grasses and other plants at ground level. Common food items for domestic guinea pigs include hay and pellet food. Wild guinea pigs forage most often around dawn and dusk, whereas captive individuals may feed more often during the day or at night. Although their foraging activity levels fluctuate, guinea pigs must eat throughout the day to maintain a high metabolic rate. They are not known to cache food for later consumption. Guinea pigs lack the enzyme L-gulonolactone oxidase and therefore cannot synthesize their own vitamin C. Wild guinea pigs supplement their diets with plant matter that naturally contains vitamin C, and it is extremely important for domestic guinea pig owners to provide supplemental sources of vitamin C through pellets, fruits, or vegetables. (Bradley, 2001; Riggs, 2009; Wagner and Manning, 1976)


Guinea pigs serve as prey for a wide range of predators in their natural ecosystems. Predators include larger mammals, birds of prey, and reptiles, such as lizards and snakes. Guinea pigs have large eyes and ears and a highly developed sense of smell, which help them detect predators before they become a threat. Guinea pigs also have behavioral adaptations that help them avoid predation. They live in social herds and use vocalizations to communicate the presence of predators to other herd members. If predators are nearby, guinea pigs will seek cover underneath vegetation or among rocks and remain very still. They have dark coloration, which helps them blend in with their environment. (Asher, et al., 2004; Wagner and Manning, 1976)

Ecosystem Roles

Guinea pigs are herbivorous herd animals and likely have an influence on the composition of plant communities. They also serve as prey for other mammals, birds, and reptiles, making them an important source of food for other animals in their environments. It is unknown if guinea pigs have other ecosystem roles.

Economic Importance for Humans: Positive

Guinea pigs are an important source of food in parts of South America, such as Peru, and also in parts of Africa, such as Côte d'Ivoire. Because they are small and breed year round, they are relatively easy to raise as part of farming practices. Thus, they serve as a source of income and food for local South American and African communities. Guinea pigs are also popular household pets around the world, and they are commonly used in research laboratories. (Kouakou, et al., 2011; Riggs, 2009)

Economic Importance for Humans: Negative

There are no known adverse effects of guinea pigs on humans.

Conservation Status

Due to their limited geographic range and high rates of predation, some wild guinea pig populations are considered to be in decline. However, all wild guinea pig species are still listed as species of "Least Concern" on the IUCN red list, with the exception of Moleques do sul guinea pigs (Cavia intermedia), which are listed as "Critically Endangered". Moleques do sul guinea pigs are endemic to a small island archipelago (~10 ha large) off the coast of southern Brazil. (Salvador and Fernandez, 2008)

  • IUCN Red List [Link]
    Not Evaluated


Kelly Ghiazza (author), Colorado State University, Audrey Bowman (editor), Colorado State University, Galen Burrell (editor), Special Projects.



living in the southern part of the New World. In other words, Central and South America.

World Map


uses sound to communicate


living in landscapes dominated by human agriculture.

bilateral symmetry

having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.


uses smells or other chemicals to communicate


having a worldwide distribution. Found on all continents (except maybe Antarctica) and in all biogeographic provinces; or in all the major oceans (Atlantic, Indian, and Pacific.


active at dawn and dusk

dominance hierarchies

ranking system or pecking order among members of a long-term social group, where dominance status affects access to resources or mates


animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.

female parental care

parental care is carried out by females


an animal that mainly eats leaves.


A substance that provides both nutrients and energy to a living thing.


an animal that mainly eats fruit


An animal that eats mainly plants or parts of plants.

male parental care

parental care is carried out by males


Having one mate at a time.


having the capacity to move from one place to another.

native range

the area in which the animal is naturally found, the region in which it is endemic.

pet trade

the business of buying and selling animals for people to keep in their homes as pets.


having more than one female as a mate at one time

scent marks

communicates by producing scents from special gland(s) and placing them on a surface whether others can smell or taste them


remains in the same area


reproduction that includes combining the genetic contribution of two individuals, a male and a female


associates with others of its species; forms social groups.


uses touch to communicate


that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).


Living on the ground.

tropical savanna and grassland

A terrestrial biome. Savannas are grasslands with scattered individual trees that do not form a closed canopy. Extensive savannas are found in parts of subtropical and tropical Africa and South America, and in Australia.


A grassland with scattered trees or scattered clumps of trees, a type of community intermediate between grassland and forest. See also Tropical savanna and grassland biome.

temperate grassland

A terrestrial biome found in temperate latitudes (>23.5° N or S latitude). Vegetation is made up mostly of grasses, the height and species diversity of which depend largely on the amount of moisture available. Fire and grazing are important in the long-term maintenance of grasslands.


living in cities and large towns, landscapes dominated by human structures and activity.


uses sight to communicate


reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female.

year-round breeding

breeding takes place throughout the year

young precocial

young are relatively well-developed when born


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