Any of various nocturnal, usually arboreal marsupials of the family Didelphidae, especially Didelphis marsupialis of the Western Hemisphere, having a thick coat of hair, a long snout, and a long prehensile tail.

• 负鼠一种夜间行动的杂食性树栖种袋鼠，尤指生长于西半球的负鼠，毛皮粗糙厚实，身体较长且粗，长有缠绕性的长尾