Premise: Bibimys chacoensis is a species of small rodent of the family Cricetidae living in the north-central part of Southern Cone of South America. It is one of the three species currently recognized under the genus "Bibimys". The common name of this species is Chaco crimson-nosed rat (in Spanish: "ratón de hocico rosado norteño" [Northern pink-nosed mice])
Hypothesis: Only mammals are a part of the family from which the Chaco crimson-nosed rat is classified.