a tall tree native to Australia, with strong-smelling leaves, that koalas eat almost exclusively
Koalas spend nearly their whole lives in eucalyptus trees, eating the leaves.
The strong smell of eucalyptus oil is often used in cough medicine.
From the textPart of the appeal for the group, when they're looking for koalas, is actually being able to find them in the thick forests of Eucalyptus.