Learning about marsupial pouches...

[Mister Obvious]

This is some amazing shit!!!

https://en.wikipedia.org/wiki/Pouch_(marsupial)

Kangaroo mothers will lick their pouches clean before the joey crawls inside. Kangaroo pouches are sticky to support their young joey. Koalas are unable to clean out their pouches since they face backwards, so just prior to giving birth to the young koala joey, a self-cleaning system is activated, secreting droplets of an anti-microbial liquid that cleans it out. In a relatively short time, the cleansing droplets clean out all of the crusty material left inside, leaving an almost sterile nursery ready to receive the tiny joey.