Invasive animals cause enormous damage to Australia's economy, environment and society. "Assessing invasive animals in Australia 2008" presents, for the first time, consistent national information on the distribution and abundance of significant invasive animals in Australia. This report is the result of collaboration between the National Land & Water Resources Audit, the Invasive Animals Cooperative Research Centre, and all states and territories. It reports on indicators of the extent and impact of 10 invasive animal species, which have been compiled from existing data sets using nationally agreed methods.