 A large , long @-@ tailed rice rat , with head and body length of 138 to 164 mm ( 5 @.@ 4 to 6 @.@ 5 in ) , Eremoryzomys polius has gray fur and short ears . There are well @-@ developed ungual tufts of hair on the hindfeet . Females have eight mammae . The rostrum ( front part of the skull ) is long and robust and the braincase is rounded . The bony palate is relatively short . The IUCN assesses the conservation status of the species as " Data Deficient " ; it is poorly known but may be threatened by habitat destruction . 
