cecum and optimizes the digestion of fibrous foods. These social animals dig a burrow made of a series of tunnels where they live in small to large groups composed of both males and females. Conservation status O. bridgesii (assessed as conspecific with O. ricardojeda) is considered vulnerable by the IUCN Red List, while O. pacificus is considered critically endangered. The other two species are considered of least concern. References External links Rodent genera Taxa named by Edward Turner Bennett