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Morphology
The pelage colors for this species resemble brown, dark yellow, and grey. This species of Oligoryzomys have small bodies and long tails. The head length of the model species for O. nigripes is 9cm. The tail length for the model species for O. nigripes is 10.5 cm. The weight of the animal ranges from 26.32 grams to 33.3 grams. The eyes of this species are rounded and jet black.

Behavior
Oligoryzomys nigripes is a nocturnal species of rodent. They live entirely on land and many of them dwell in the trees. They are proficient at climbing these trees. This species is a known insectivore, but can be frugivorous. Therefore, O. nigripes is considered an omnivore. They scavenge for nutrient sources in things such as fruits, insects, and seeds.

Karyotype
There are 31 pairs of chromosomes found in the Oligoryzomys nigripes species. The diploid formula for this species is 2n=62. There are 60 autosomal chromosomes and 2 sex chromosomes found in this species.