[2] It is found in Belize, Colombia, Ecuador, Grenada, Honduras, Panama, Peru, Trinidad and Tobago, and Venezuela.

[1] Robinson's mouse opossums move along tree branches and vines with the help of a prehensile tail and may leap between gaps as they search for fruit and insects.

It possesses a prehensile tail about 1.3 times its body length, which is covered in fine white hairs.

[1] A study conducted in a xeric shrubland of northwestern Venezuela found that females of Marmosa robinsoni increase in mass three time faster than males.

There are observations that M. robinsoni feeds on fruits of columnar cacti,[1] although the species is also expected to prey on insects (as many didelphids do).

This hierarchy is related to reproduction and involves the males asserting their dominance by marking their cages with an oily secretion.

[5] The known distribution of Marmosa robinsoni extends from Finca Santa Clara in the western Panamanian province of Chiriquì, eastward across the isthmus to Colombia and northern Venezuela.