Eucalyptus trees are important to koalas for the following reasons:
1. **Food source:** Koalas feed exclusively on eucalyptus leaves, which make up 90% of their diet. Eucalyptus leaves are high in fiber, low in protein, and contain toxins that are poisonous to most other animals. However, koalas have a special digestive system that allows them to break down the toxins and extract nutrients from the leaves.
2. **Habitat:** Eucalyptus trees provide habitat for koalas. Koalas spend most of their time in the branches of eucalyptus trees, where they sleep, eat, and socialize. Koalas are territorial animals and will defend their home range, which typically includes several eucalyptus trees.
3. **Water source:** Koalas get most of their water from eucalyptus leaves. Eucalyptus leaves contain a lot of water, which koalas can extract through their digestive system. During periods of drought, koalas may also drink water from tree hollows or other sources.
4. **Breeding:** Eucalyptus trees play an important role in koala breeding. Female koalas will only mate with males within their home range, which is typically centered around a group of eucalyptus trees. Male koalas will also use eucalyptus trees to mark their territory and attract mates.