有袋目的无胎盘哺乳动物的一种，包括袋鼠、负鼠、袋狸和毛鼻袋熊，主要生活在澳大利亚和美洲

• any of various nonplacental mammals of the order Marsupialia,including kangaroos,opossums,bandicoots,and wombats,found principally in Australia and the Americas