Maras, subfamily Dolichotinae, are a group of rodents in the family Caviidae. These large relatives of guinea pigs are common in the Patagonian steppes of Argentina, but also live in Paraguay and elsewhere in South America. The two extant species are the Patagonian mara and the Chacoan mara. Traditionally, both species have been included in the genus Dolichotis, but a 2020 study by the American Society of Mammalogists found significant difference to warrant resurrecting the genus Pediolagus for the Chacoan mara. Several extinct genera are also known.