Guinea pigs are also called cavies. Guinea Pigs are rodents belonging to the family Caviidae and the genus Cavia. Guinea pigs are classified in order Rodentia, although there is a minority belief in the scientific community that evidence from mitochondrial DNA indicates that the Hystricognathi may belong to a different evolutionary offshoot, and therefore a different order. Guinea Pigs are not pigs nor do they come from Guinea. Although there are from 6 to 9 different species, the one most familiar to people is C. porcellus, the common guinea pig.
Picture By : hamsteronline.com
Article By : http://www.guineapigsclub.com/gp_site/info.asp