Kalmar "Marsupialia" tana nufin tsarin haraji na dabbobi masu shayarwa wanda ya haɗa da kangaroos, wallabies, possums, koalas, da sauran nau'in. Wadannan dabbobin suna da alaƙa da kasancewar jaka, wanda ake kira marsupium, wanda 'ya'yansu ke tasowa bayan haihuwa. Kalmar “tsari” a cikin wannan mahallin tana nufin matakin rarrabuwar haraji sama da iyali da kuma ƙasa da aji, kuma tana nuni da cewa dukkan ma’aurata suna raba wasu halaye na dabi’a da dabi’u waɗanda ke bambanta su da sauran rukunin dabbobi masu shayarwa.