Oligoryzomys flavescens
The boundary between the upper parts and the underparts is indistinct, grading from one colour to the other.Skull features that distinguish this species include the long incisive foramina (openings in the hard palate) that usually reach the first molar, and the short mesopterygoid fossa (a depression behind the end of the palate) which does not extend as far as the third molar.It is found in a variety of habitats, often near water, from sea level up to about 1,800 m (5,900 ft).[1][4] O. flavescens is the principal reservoir host of certain hantaviruses,[5] which are harmless to rodents but cause disease in humans.This is on the basis that it has a wide range, is presumed to have a large total population, occurs in several protected areas and tolerates some degree of disturbance to its habitat.