Marsupials Temporal range: Paleocene – Holocene 65–0 mya
Scientific classification
Unrecognized taxon (fix):	Metatheria
Infraclass:	Marsupialia
Orders
Ameridelphia Didelphimorphia Paucituberculata Australidelphia Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia †Yalkaparidontia
Present-day distribution of marsupials.

A developing kangaroo in its pouch.

Marsupials are the main part of an infraclass of mammals called the Metatheria. This consists of the marsupials and their extinct ancestors. There are about 320 different species.