The White-eared Cotton Rat was one of five cotton rats compared in a 1971 study. In the captive young studied, growth was rapid until about 40 days of age and then slowed.
Among the five species compared, it was described as one of the smaller cotton rats, with a relatively short tail. Traits given for the genus as a whole are not attributed solely to this species.
A study of captive offspring from wild-caught parents found rapid growth until about 40 days of age, followed by slower growth.
An extinction-risk assessment has not been added yet.