 They have grey or black fur on their dorsal side with yellowish fur on the lateral side that continues down to the feet.They are the most mysterious of all the "Monodelphis" that is found specifically in the Pampean region or Pampa of Argentina.It is suspected to be a once-in-a-lifetime breeder as seen in a three-year observational study of one population in the marshy grasslands of the Pampean region.