A bushfire is a wildfire that happens in the Australian bush. Bush is the word for scrub, woodland or grassland of Australia and New Zealand. In south east and south west of Australia, bushfires are most common in the summer and early autumn. In the north of Australia, bushfires usually happen during winter which is the dry season. Many Australian plants burn easily. Eucalyptus trees have a high oil content which makes them burn. Over the last 40 years, Australian bushfires have cost A$2.5 billion. In the same period, Australian bushfires caused the death of around 250 people and the destruction of 4,554 homes. And these figures do not include the 173 people who died and the 2000 homes destroyed in the 2009 Victorian bushfires. They can also kill wildlife including rare koalas.