One of the strange things for me traveling around the world is the sudden appearance of a eucalypt. It's linked so inextricablly to Australia in my mind that spotting one, or a small forrest of them, confuses me.
I guess they are strong and used to dry and hot conditions. They help to keep the soil in tact in places that have been ravaged by development. But they also poison everything. There is a reason koalas sleep 16 hours a day.