The animal that is considered as the world's fussiest eater is the koala that is fed exclusively on eucalyptus leaves.
Koalas spend the most of the day sleeping and usually eat by night.

They spent 3 of their 5 active hours in a day eating, chewing the leaves very well and converting them in a pulp before swallowing.

Koalas can eat leaves of any specie of eucalyptus but among them they have their own preferences: Manna Gum, Blue Gum and Swamp Gum.

Even though eucalyptus leaves can cause indigestion to most animals, koalas can digest them due to their adaptation to the environment.