Which Eucalyptus tree? There are between 700-900 species and they look nothing alike.

See E. grandis, E. tetraptera, E. chartaboma, E. deglupta, E. pulverulenta for examples of diversity

Some are incredibly tall with really smooth skin, some are basically bushes, some have really messy papery bark; some even have rainbow bark! Some have really long leaves while some have extremely short tightly wound round leaves