Eucalypt forest fires are bad because the leaves are full of oil and when it's hot, dry and windy, they're extremely flammable and the fire races through the tops of the trees at incredible speeds, and jumps across large fire breaks that appear to be wide enough that they should stop it.

But at the same time the wood is also very dense, so makes great campfire wood, but doesn't burn so much in a forest fire, which is a bit ironic...