<Li> Squealing or shrieking is a high - pitched sound of discontent, in response to pain or danger . listen (help info) </Li> <Li> Chirping, a less - common sound, likened to bird song, seems to be related to stress or discomfort, or when a baby guinea pig wants to be fed . Very rarely, the chirping will last for several minutes . listen (help info) </Li> <P> C. porcellus is not found naturally in the wild; it is likely descended from closely related species of cavies, such as C. aperea, C. fulgida, and C. tschudii, which are still commonly found in various regions of South America . Studies from 2007--2010 applied molecular markers and studied the skull and skeletal morphology of current and mummified animals, thereby revealing the ancestor to most likely be Cavia tschudii . Some species of cavy identified in the 20th century, such as C. anolaimae and C. guianae, may be domestic guinea pigs that have become feral by reintroduction into the wild . Wild cavies are found on grassy plains and occupy an ecological niche similar to that of cattle . They are social, living in the wild in small groups that consist of several females (sows), a male (boar), and the young (which, in a break with the preceding porcine nomenclature, are called "pups" not "piglets"). They move together in groups (herds) eating grass or other vegetation, and do not store food . While they do not burrow themselves or build nests, they frequently seek shelter in the burrows of other animals, as well as in crevices and tunnels formed by vegetation . They tend to be most active during dawn and dusk (crepuscular), when it is harder for predators to spot them . </P> <P> Domesticated guinea pigs thrive in groups of two or more; groups of sows, or groups of one or more sows and a neutered boar are common combinations, but boars can sometimes live together . Guinea pigs learn to recognize and bond with other individual pigs, and testing of boars shows their neuroendocrine stress response is significantly lowered in the presence of a bonded female when compared to the presence of unfamiliar females . Groups of boars may also get along, provided their cage has enough space, they are introduced at an early age, and no females are present . Domestic guinea pigs have developed a different biological rhythm from their wild counterparts, and have longer periods of activity followed by short periods of sleep in between . Activity is scattered randomly throughout the day; aside from an avoidance of intense light, no regular circadian patterns are apparent . </P>

Where do guinea pigs live in the world
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