Here is a simple explanation:
- Eucalyptus leaves can have a little poison that makes many animals sick.
- Most animals won’t eat them because of that.
- Koalas are special: their bodies can handle the poison so they don’t get sick.
- Koalas also like the taste, so they eat the leaves a lot.
- Because the leaves don’t give much energy, koalas sleep a lot to save energy.
People and most animals should not eat eucalyptus leaves — only koalas can safely eat them.