C. a. aperea C. a. guianae C. a. hypoleuca C. a. pamparum C. a. patzelti C. a. rosida The Brazilian guinea pig (Cavia aperea) (preá in Portuguese) is a wild guinea pig species found in Argentina, Brazil, Bolivia, Colombia, Ecuador, Guyana, Paraguay, Uruguay and Venezuela.

This is a medium-sized guinea pig with an adult length of about 272 mm (11 in) and a weight of 637 grams (22.5 oz).

The dorsal fur is dark olive-brown mixed with brown and black, and the underparts are a pale grey or yellowish-grey.

[1] The Brazilian guinea pig has a wide distribution in South America at altitudes between 400 and 3,000 metres (1,300 and 9,800 ft) above sea level.

It is a common species with a stable population and, as well as living in open savannah country, it is capable of adapting to disturbed habitats.