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The article discusses research on the diet variation of the marsupials Philander frenatus and Didelphis aurita in the rural part of Rio de Janeiro, Brazil. It references a study by Paula Ceotto at the Instituto de Biologia Departamento de Ecologia in Brazil, and her colleagues, published in an issue of "Mastozoologia Neotropical." The researchers studied the faeces of both species, which were gathered carefully from the bottom part of live traps that were used to capture the animals. They found that the differences in the consumption of vertebrates among individuals of P. frenatus from varying dental age classes can somehow be related to the lower cusps height of their juveniles, fewer tooth and small body size.