The domesticated guinea pig (Cavia porcellus) does not live in the wild but is most likely derived from the Andean montane guinea pig (Cavia tschudii) found in Peru, highland Bolivia, northwestern Argentina and northeastern Chile. Guinea pigs were first domesticated in 5,000 B.C. and are now globally distributed as pets and for their meat.
Guinea pigs have no tails. The length, texture and color of their fur varies by breed. There are now 13 different breeds of domestic guinea pigs: American, American satin, Abyssinian, Abyssinian satin, Peruvian, Peruvian satin, silkie, silkie satin, teddy, teddy satin, Texel, coronet and white-crested. Through selective breeding, 20 different fur color phenotypes and 13 different coat length and texture phenotypes exist among these guinea pig breeds.
These rodents have two defensive responses: the immobility response and the scatter response. The immobility response occurs when a single guinea pig perceives danger. During this response, the guinea pig becomes completely immobile until the threat has passed. The scatter response involves a group of guinea pigs. When the group perceives a threat, they scatter and split up to confuse a predator.
Guinea pigs have spread across the globe as popular laboratory animals and pets but were first domesticated and used as a traditional food source in South America. Their wild ancestors (Cavia tschudii) are native to the Andes mountains, from Peru to Argentina, and live at altitudes of more than 14,000 feet.
Guinea pigs produce six main vocalizations: chutts, squeaks, whines, whistles, purrs and chirps. Each vocalization conveys a different meaning. A chutt is used during predatory pursuit and whines after predatory pursuit. Squeals, squeaks and tweets indicate the presence of danger or injury. And finally, whistles and chirps convey the presence of food and are used for long-distance communication.
Guinea pigs are adapted to a diet of the herbs and grasses of montane (or mountain) meadows. As pets, they are commonly fed lettuce, cabbage, grasses, barley and Timothy hay. They are also fed pellets that are made of compressed plant material (usually alfalfa or barley). These pellets are enhanced with different vitamins and minerals vital to guinea pig health.
At the Smithsonian's National Zoo, guinea pigs eat greens, carrots, peppers, oranges, kiwis and grains.
Guinea pigs can live up to 14 years in human care but live an average of 8 years. Female guinea pigs that reproduce have shortened lifespans and tend to live approximately 3.5 years.
This shortened lifespan is caused by the stiffening of a joint called the symphysis, which is located between the guinea pig's two pelvic bones. Pregnancy causes this stiffening and results in an inability to birth young naturally, which usually results in death due to birthing complications.
- Choose your pets wisely, and do your research before bringing an animal home. Exotic animals don’t always make great pets. Many require special care and live for a long time. Tropical reptiles and small mammals are often traded internationally and may be victims of the illegal pet trade. Never release animals that have been kept as pets into the wild.
Amazonia is home to seven female guinea pigs. Imilla is a teddy guinea pig. Her name means "girl" in the Aymara language. Peruvian guinea pig Masi's name is also Aymaran and means "friend." The other guinea pigs have names of Quechan origin. Inti, Sinchi and Miski are Abyssinian guinea pigs. Inti's name means "sun." Her sister Sinchi's name means "brave," and their half-sister Miski's name means "sweet" or "good." Peruvian guinea pig Sani's name means "brown," and American guinea pig Tuta's name means "night."