The excrement, called pap, comes from their mother and can smell like eucalyptus because of their eucalyptus leaf diet. It has the microbes baby koalas/joeys need to digest eucalyptus leaves.

You may also like...

Koalas require a lot of sleep because their food gives them very little energy and eucalyptus requires a lot of energy to digest

Koalas are the sleepiest animals in the world—sleeping up to 22 hours a day

Koalas are marsupials that carry their young, called joeys, in a pouch