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short-tailed opossum, (genus Monodelphis), any of more than 20 species of small, mouse- and shrew-sized, insectivorous and carnivorous, terrestrial opossums (family Didelphidae, subfamily Didelphinae, tribe Marmosini). Total length varies from about 11 cm (4.5 inches) in the smaller species to over 28 cm (11 inches) in the larger. The genus is known from eastern Panama (one species) and throughout South America from the Andes eastward and south to central Argentina. Short-tailed opossums vary in colour...