Marsupial

A marsupial is a type of lifeform with an external pouch used for incubating its young. Marsupials on many different planets in the Milky Way Galaxy.

Akritiri
The Akritirian chaka emu was a hybrid marsupial from Akritiri in the Delta Quadrant. 

Arcadia
The Arcadians had a pouch in which their newborns spent the first three to six months of their lives. 

Archer IV
A landing party from the Earth Starfleet starship  Enterprise identified several nocturnal marsupials on Archer IV in 2151. 

Boreth
The planet Boreth in the Klingon Empire was home to the bolmaq. 

Earth
On Earth, many types of marsupials were mammals that evolved in and around Australia, such as the kangaroo and koala. 

Trill
The Trill humanoids from the planet were marsupials, and the dominant race on their world. There were four-legged animals on Trill that were also marsupials.