marsupial

pussi-

pussieläin A mammal of which the female has a pouch in which it rears its young, which are born immature, through early infancy, such as the kangaroo or koala, or else pouchless members of the Marsupialia like the shrew opposum.
Of or pertaining to a marsupial.
1892, The American naturalist‎, page 125:

Showing that this animal is marsupial, consists of the following characters.

It seemed to me, meandering around Earls Court, that motors should be more marsupial.

But there's this pouch just below my belly button, very marsupial, where the kangaroo lives.

the marsupial bones