 As far as now known , Eremoryzomys polius is confined to a small area in central Peru , at an altitude of 760 to 2 @,@ 100 m ( 2 @,@ 490 to 6 @,@ 890 ft ) , but the species may range more widely . It occurs in forest in the dry lowlands of the upper parts of the basin of the Marañón River , east of the main mountain range of the Andes . The biogeographical pattern indicated by the relationship between Eremoryzomys and the Brazilian Drymoreomys is unusual . While there are some similar cases of relationships between Andean and Atlantic Forest animals , these involve inhabitants of humid forests in the Andes ; Eremoryzomys , in contrast , lives in an arid area . Because E. polius is so poorly known , the 2008 IUCN Red List assesses it as " Data Deficient " . It is threatened by habitat destruction for cattle pasture and is not known from any protected areas . 
