They are built somewhat like pigs, with large heads relative to their bodies, stout necks, and rounded rumps with no tail of any consequence; some of the sounds they emit are very similar to those made by pigs, and they also spend a large amount of time eating.
Guinea pigs tend to be messy within their cages; they often jump into their food bowls or kick bedding and feces into them, and their urine sometimes crystallizes on cage surfaces, making it difficult to remove.
Male guinea pigs may also mark their territory in this way when they are taken out of their cages.
In Western societies, the domestic guinea pig has enjoyed widespread popularity as a household pet since its introduction by European traders in the 16th century.
Their docile nature; friendly, even affectionate responsiveness to handling and feeding; and the relative ease of caring for them, continue to make guinea pigs a popular pet.
The domestic guinea pig (Cavia porcellus), or simply guinea pig, also known as cavy or cuy as livestock, is a species of rodent belonging to the family Caviidae and the genus Cavia.