The Guinea Pig, Cavia porcellus , is a mammal of the order Rodentia, sub-order Hystricomorpha and family Caviidae. Three basic breeds of guinea pigs exist.
Guinea pigs have several unique biological characteristics.
Both types of guinea pigs are available for purchase. To maintain the SPF microbial status of guinea pigs may require that animals be housed in more stringent conditions that prevent the introduction of other pathogens such as isolation in separate rooms or barrier housing. This type of housing is available at the University of Iowa, though it is typically not required or utilized by investigators. Guinea pigs can also be categorized genetically. Pigmented guinea pigs of all three breeds are also available.