Difference between Marsupial and Pouch

What is the difference between Marsupial and Pouch?

Marsupial as a noun is any mammal of which the female typically has a pouch in which it rears its young, which are born immature, through early infancy, such as the kangaroo or koala. while Pouch as a noun is a small bag usually closed with a drawstring

We hope you now know whether to use Marsupial or Pouch in your sentence.